<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:c0dc60c2-50af-4954-a9a6-2cbe01b5efc2,g:a6331c9c-ff57-4c5c-9def-15c2c33acec1-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://beyond.com/role/CoverPage" xlink:type="simple" xlink:href="byon-20250930.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://beyond.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_0dd9335e-9b40-4088-9ce6-04a01dcc1982" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_EntitiesTable_0dd9335e-9b40-4088-9ce6-04a01dcc1982" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_9627dd42-94b0-48e9-86cb-b8f223affda9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_0dd9335e-9b40-4088-9ce6-04a01dcc1982" xlink:to="loc_us-gaap_StatementClassOfStockAxis_9627dd42-94b0-48e9-86cb-b8f223affda9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_9627dd42-94b0-48e9-86cb-b8f223affda9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_9627dd42-94b0-48e9-86cb-b8f223affda9" xlink:to="loc_us-gaap_ClassOfStockDomain_9627dd42-94b0-48e9-86cb-b8f223affda9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_c52c8a1e-e7c6-4586-84cc-6713ca81186c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_9627dd42-94b0-48e9-86cb-b8f223affda9" xlink:to="loc_us-gaap_ClassOfStockDomain_c52c8a1e-e7c6-4586-84cc-6713ca81186c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_6e485258-3709-453d-8bdb-aca0b5415043" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_c52c8a1e-e7c6-4586-84cc-6713ca81186c" xlink:to="loc_us-gaap_CommonStockMember_6e485258-3709-453d-8bdb-aca0b5415043" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_WarrantsToPurchaseSharesOfCommonStockMember_3b187591-87ef-40d7-bdad-753975e7d045" xlink:href="byon-20250930.xsd#byon_WarrantsToPurchaseSharesOfCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_c52c8a1e-e7c6-4586-84cc-6713ca81186c" xlink:to="loc_byon_WarrantsToPurchaseSharesOfCommonStockMember_3b187591-87ef-40d7-bdad-753975e7d045" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_367aeb22-5d1f-465f-84a7-8e4379beff3b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_DocumentType_367aeb22-5d1f-465f-84a7-8e4379beff3b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_b50c65ab-c2af-458c-93f1-5476d217080e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_DocumentQuarterlyReport_b50c65ab-c2af-458c-93f1-5476d217080e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_36763401-5b05-4136-a296-0adbb8bead04" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_DocumentPeriodEndDate_36763401-5b05-4136-a296-0adbb8bead04" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_1235e6c9-e0fd-431a-acc9-4e22c5151460" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_DocumentTransitionReport_1235e6c9-e0fd-431a-acc9-4e22c5151460" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_ed8f510b-882f-4360-8eba-b574c2769770" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_EntityFileNumber_ed8f510b-882f-4360-8eba-b574c2769770" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_930e7eaf-2644-4018-a0e3-ed0225c67bbe" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_EntityRegistrantName_930e7eaf-2644-4018-a0e3-ed0225c67bbe" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_7a907950-214f-419d-8cf0-336ac2bbbc9f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_EntityIncorporationStateCountryCode_7a907950-214f-419d-8cf0-336ac2bbbc9f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_5ae5e859-e126-498d-be93-18ec0680fa23" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_EntityTaxIdentificationNumber_5ae5e859-e126-498d-be93-18ec0680fa23" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_41b8d314-afc9-4e72-9f2a-fe28f7fb52e7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_EntityAddressAddressLine1_41b8d314-afc9-4e72-9f2a-fe28f7fb52e7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_1452b4c3-1ef4-4ddf-8f19-a891fe605d07" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_EntityAddressCityOrTown_1452b4c3-1ef4-4ddf-8f19-a891fe605d07" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_d96cc65c-5920-4342-9b03-d748f2c4915d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_EntityAddressStateOrProvince_d96cc65c-5920-4342-9b03-d748f2c4915d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_48ee1485-b917-493e-8f96-96c3c832faba" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_EntityAddressPostalZipCode_48ee1485-b917-493e-8f96-96c3c832faba" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_6bd2541d-9d6b-452f-a61b-f7381168d943" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_CityAreaCode_6bd2541d-9d6b-452f-a61b-f7381168d943" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_29ba9a79-6688-4602-ad19-590bc8211c7a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_LocalPhoneNumber_29ba9a79-6688-4602-ad19-590bc8211c7a" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_dd8c5475-45ac-45ae-9614-4ca38d6cc4dd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_Security12bTitle_dd8c5475-45ac-45ae-9614-4ca38d6cc4dd" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_724e3c21-526c-4d32-aed8-bd444f1240f4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_TradingSymbol_724e3c21-526c-4d32-aed8-bd444f1240f4" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_f4fd50b4-780b-4b81-803e-0537f8349644" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_SecurityExchangeName_f4fd50b4-780b-4b81-803e-0537f8349644" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_2fd6e618-c408-42ea-9afd-a3795e25b62e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_EntityCurrentReportingStatus_2fd6e618-c408-42ea-9afd-a3795e25b62e" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_422dc65e-8127-4f9f-ba6d-f80b2b7af84e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_EntityInteractiveDataCurrent_422dc65e-8127-4f9f-ba6d-f80b2b7af84e" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_0796ed20-db15-4458-be4e-0c54f4c8c265" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_EntityFilerCategory_0796ed20-db15-4458-be4e-0c54f4c8c265" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_927e5615-c176-4626-9dd6-c1a4404c874c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_EntitySmallBusiness_927e5615-c176-4626-9dd6-c1a4404c874c" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_d3c6b007-8ec5-4747-a48c-04136ea2d180" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_EntityEmergingGrowthCompany_d3c6b007-8ec5-4747-a48c-04136ea2d180" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_f26a78f7-5510-41f4-b584-8d9393657319" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_EntityShellCompany_f26a78f7-5510-41f4-b584-8d9393657319" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_893d7570-4ddf-4d3b-a878-d23e9b293b85" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_893d7570-4ddf-4d3b-a878-d23e9b293b85" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_3a7ac28b-3ae8-4759-bb00-8beac66504c6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_EntityCentralIndexKey_3a7ac28b-3ae8-4759-bb00-8beac66504c6" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_260398a6-4a68-4db2-9153-f0862437a198" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_AmendmentFlag_260398a6-4a68-4db2-9153-f0862437a198" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_0dbd53e9-34bd-4ac6-ab6a-b0750845eef5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_CurrentFiscalYearEndDate_0dbd53e9-34bd-4ac6-ab6a-b0750845eef5" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_ac6d665d-0a8f-48a0-92b8-16e8e1422137" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_DocumentFiscalPeriodFocus_ac6d665d-0a8f-48a0-92b8-16e8e1422137" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_51fd541f-e5f3-4716-b19a-e76f483d3dc4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_dedd9bfb-6c43-4cfb-bb1e-6516e98e83c4" xlink:to="loc_dei_DocumentFiscalYearFocus_51fd541f-e5f3-4716-b19a-e76f483d3dc4" xlink:type="arc" order="28"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/ConsolidatedStatementsofChangesinStockholdersEquityUnaudited" xlink:type="simple" xlink:href="byon-20250930.xsd#ConsolidatedStatementsofChangesinStockholdersEquityUnaudited"/>
  <link:definitionLink xlink:role="http://beyond.com/role/ConsolidatedStatementsofChangesinStockholdersEquityUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_1c322ad6-bf7f-43cf-8dcc-3d5ac33ea087" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_aad5567c-7678-4cea-abe6-d8946fdeedee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_1c322ad6-bf7f-43cf-8dcc-3d5ac33ea087" xlink:to="loc_us-gaap_StatementTable_aad5567c-7678-4cea-abe6-d8946fdeedee" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_bc1c9c61-1560-4575-a533-895b83cd4862" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_aad5567c-7678-4cea-abe6-d8946fdeedee" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_bc1c9c61-1560-4575-a533-895b83cd4862" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_bc1c9c61-1560-4575-a533-895b83cd4862_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_bc1c9c61-1560-4575-a533-895b83cd4862" xlink:to="loc_us-gaap_EquityComponentDomain_bc1c9c61-1560-4575-a533-895b83cd4862_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_67ae9769-30e0-4b0a-8e15-93af1bcce85a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_bc1c9c61-1560-4575-a533-895b83cd4862" xlink:to="loc_us-gaap_EquityComponentDomain_67ae9769-30e0-4b0a-8e15-93af1bcce85a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_6159ff9b-9002-4533-a84e-9313e004d509" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_67ae9769-30e0-4b0a-8e15-93af1bcce85a" xlink:to="loc_us-gaap_ParentMember_6159ff9b-9002-4533-a84e-9313e004d509" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_cafe4fe8-9610-4650-bf76-ce020fca1911" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_6159ff9b-9002-4533-a84e-9313e004d509" xlink:to="loc_us-gaap_CommonStockMember_cafe4fe8-9610-4650-bf76-ce020fca1911" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_a4d8bf1c-3611-4166-bb20-7aa416fadba8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_6159ff9b-9002-4533-a84e-9313e004d509" xlink:to="loc_us-gaap_TreasuryStockCommonMember_a4d8bf1c-3611-4166-bb20-7aa416fadba8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_a63da243-9a17-459a-9fdd-22a911d8e2a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_6159ff9b-9002-4533-a84e-9313e004d509" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_a63da243-9a17-459a-9fdd-22a911d8e2a9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_3927fca3-bda1-439d-a487-e1d36a99e863" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_6159ff9b-9002-4533-a84e-9313e004d509" xlink:to="loc_us-gaap_RetainedEarningsMember_3927fca3-bda1-439d-a487-e1d36a99e863" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_f2f0d483-0438-4c59-b622-6435122a5836" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_6159ff9b-9002-4533-a84e-9313e004d509" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_f2f0d483-0438-4c59-b622-6435122a5836" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_2f63129b-36e6-44ed-a58a-01df8813c394" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_67ae9769-30e0-4b0a-8e15-93af1bcce85a" xlink:to="loc_us-gaap_NoncontrollingInterestMember_2f63129b-36e6-44ed-a58a-01df8813c394" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1c322ad6-bf7f-43cf-8dcc-3d5ac33ea087" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_aed05bd9-f39c-46d5-b178-b386e286b8ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_SharesOutstanding_aed05bd9-f39c-46d5-b178-b386e286b8ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_f140fa26-8d6f-4a36-a921-eb5777f7a3d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_f140fa26-8d6f-4a36-a921-eb5777f7a3d1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_46aefe52-c26b-45ed-986e-6fd5bf24b7a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_46aefe52-c26b-45ed-986e-6fd5bf24b7a1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_adb05caf-f0d0-42d0-b63a-33353391eccc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_adb05caf-f0d0-42d0-b63a-33353391eccc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_85d14f71-1ec4-4aaa-bab8-e1e70f57adc0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_46de14b2-4496-4741-95ed-ab5b3678f7ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_TreasuryStockCommonShares_46de14b2-4496-4741-95ed-ab5b3678f7ba" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_87548659-ce61-4489-b985-0d68aa636087" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_87548659-ce61-4489-b985-0d68aa636087" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_c4cf3bfd-db36-4530-b66c-e26bc75938c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_c4cf3bfd-db36-4530-b66c-e26bc75938c4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_cdb38d9e-23b6-40dc-9de6-3f89d6d28403" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_e531efb8-42d5-454b-af0b-529e7f0dbb92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_e531efb8-42d5-454b-af0b-529e7f0dbb92" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_a7d514e6-187c-4009-b59c-3f3386127658" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_a7d514e6-187c-4009-b59c-3f3386127658" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_317e80f3-9624-453d-9551-10f75d83e730" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_317e80f3-9624-453d-9551-10f75d83e730" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition_53a65c55-8681-48d1-bc6d-8a77182f431d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition_53a65c55-8681-48d1-bc6d-8a77182f431d" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_d756e4e9-d908-4be5-821d-775e0560fa01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_d756e4e9-d908-4be5-821d-775e0560fa01" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_aab867a5-7bd3-41fc-a0f1-a69ab5a7d213" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_NetIncomeLoss_aab867a5-7bd3-41fc-a0f1-a69ab5a7d213" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_3cc16404-0b7a-4c71-a9e7-50e4f5a2a913" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_3cc16404-0b7a-4c71-a9e7-50e4f5a2a913" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_dc25b12c-b2a5-496d-b5dd-edb678a6beab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_dc25b12c-b2a5-496d-b5dd-edb678a6beab" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_af4be3bf-06a7-460e-b2c2-dec7d6815e4a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_af4be3bf-06a7-460e-b2c2-dec7d6815e4a" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance_41b194e1-e696-4e06-beb2-ba8a078f7711" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance_41b194e1-e696-4e06-beb2-ba8a078f7711" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_c9c8d7c7-088c-4f63-96ea-b774de37b514" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_b8e3e273-d0d3-4ba3-a8df-6c4b79786d8e" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_c9c8d7c7-088c-4f63-96ea-b774de37b514" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_f34867b3-7fc4-461b-b2ed-8b0fe940d687" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleofRevisionofPreviouslyIssuedFinancialStatementsDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleofRevisionofPreviouslyIssuedFinancialStatementsDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleofRevisionofPreviouslyIssuedFinancialStatementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_83f2dd86-7192-4937-91cc-5a892183dc46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_d6780f30-9503-40cb-806c-93b2c926a608" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_83f2dd86-7192-4937-91cc-5a892183dc46" xlink:to="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_d6780f30-9503-40cb-806c-93b2c926a608" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_53b33af4-abd5-419f-be97-1538631d1172" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_d6780f30-9503-40cb-806c-93b2c926a608" xlink:to="loc_srt_RestatementAxis_53b33af4-abd5-419f-be97-1538631d1172" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_53b33af4-abd5-419f-be97-1538631d1172_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_53b33af4-abd5-419f-be97-1538631d1172" xlink:to="loc_srt_RestatementDomain_53b33af4-abd5-419f-be97-1538631d1172_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_dad9e837-f331-46d1-bc86-aaad10040a63" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_53b33af4-abd5-419f-be97-1538631d1172" xlink:to="loc_srt_RestatementDomain_dad9e837-f331-46d1-bc86-aaad10040a63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioPreviouslyReportedMember_8cfc6087-513f-4a94-9d32-88fd7bc6b14c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioPreviouslyReportedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_dad9e837-f331-46d1-bc86-aaad10040a63" xlink:to="loc_srt_ScenarioPreviouslyReportedMember_8cfc6087-513f-4a94-9d32-88fd7bc6b14c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RevisionOfPriorPeriodErrorCorrectionAdjustmentMember_85523eae-cc5c-4358-b746-e90b12ee8001" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RevisionOfPriorPeriodErrorCorrectionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_dad9e837-f331-46d1-bc86-aaad10040a63" xlink:to="loc_srt_RevisionOfPriorPeriodErrorCorrectionAdjustmentMember_85523eae-cc5c-4358-b746-e90b12ee8001" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_cd2e3cd8-b8ce-4bea-ab7f-48a5e7580ffd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_83f2dd86-7192-4937-91cc-5a892183dc46" xlink:to="loc_us-gaap_OperatingExpensesAbstract_cd2e3cd8-b8ce-4bea-ab7f-48a5e7580ffd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseNet_c5924075-f5a5-46ec-bc5c-d82e1be7dc44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherOperatingIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_cd2e3cd8-b8ce-4bea-ab7f-48a5e7580ffd" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseNet_c5924075-f5a5-46ec-bc5c-d82e1be7dc44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_8f7db29b-1223-4857-98f8-5e04ee1e5a88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_cd2e3cd8-b8ce-4bea-ab7f-48a5e7580ffd" xlink:to="loc_us-gaap_OperatingExpenses_8f7db29b-1223-4857-98f8-5e04ee1e5a88" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_efc5267f-7f4a-49ea-86c0-4591f4c0ca11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_83f2dd86-7192-4937-91cc-5a892183dc46" xlink:to="loc_us-gaap_OperatingIncomeLoss_efc5267f-7f4a-49ea-86c0-4591f4c0ca11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_22239ebb-b198-4041-a8bf-c7cc7f6d1765" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_83f2dd86-7192-4937-91cc-5a892183dc46" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_22239ebb-b198-4041-a8bf-c7cc7f6d1765" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_317f9a0f-1555-416a-9204-20114a91bd08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_83f2dd86-7192-4937-91cc-5a892183dc46" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_317f9a0f-1555-416a-9204-20114a91bd08" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_280b6016-d95d-4d90-8efa-29b85eab535d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_83f2dd86-7192-4937-91cc-5a892183dc46" xlink:to="loc_us-gaap_ProfitLoss_280b6016-d95d-4d90-8efa-29b85eab535d" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_555723e2-980c-4423-8a1c-3415f2b6f843" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_5419d3e0-096d-4535-a672-d92a1d6ec912" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_555723e2-980c-4423-8a1c-3415f2b6f843" xlink:to="loc_us-gaap_DebtInstrumentTable_5419d3e0-096d-4535-a672-d92a1d6ec912" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_5582c866-f709-484e-806a-ecc2e7aaf6a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_5419d3e0-096d-4535-a672-d92a1d6ec912" xlink:to="loc_us-gaap_DebtInstrumentAxis_5582c866-f709-484e-806a-ecc2e7aaf6a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_5582c866-f709-484e-806a-ecc2e7aaf6a4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_5582c866-f709-484e-806a-ecc2e7aaf6a4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_5582c866-f709-484e-806a-ecc2e7aaf6a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_3239fd3a-39cc-497f-8cb9-e8dce8c0962a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_5582c866-f709-484e-806a-ecc2e7aaf6a4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_3239fd3a-39cc-497f-8cb9-e8dce8c0962a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_AdditionalTermLoanMember_0fdaf538-3dfd-4935-a4c4-72cd1d26bb4d" xlink:href="byon-20250930.xsd#byon_AdditionalTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3239fd3a-39cc-497f-8cb9-e8dce8c0962a" xlink:to="loc_byon_AdditionalTermLoanMember_0fdaf538-3dfd-4935-a4c4-72cd1d26bb4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_AmendedAndRestatedCreditAgreementMember_cde8815f-c46e-4328-9e07-dde52397e704" xlink:href="byon-20250930.xsd#byon_AmendedAndRestatedCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3239fd3a-39cc-497f-8cb9-e8dce8c0962a" xlink:to="loc_byon_AmendedAndRestatedCreditAgreementMember_cde8815f-c46e-4328-9e07-dde52397e704" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_DelayedDrawTermLoanCommitmentsMember_c0d77d2e-90c2-4777-b72e-48575bd497e9" xlink:href="byon-20250930.xsd#byon_DelayedDrawTermLoanCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3239fd3a-39cc-497f-8cb9-e8dce8c0962a" xlink:to="loc_byon_DelayedDrawTermLoanCommitmentsMember_c0d77d2e-90c2-4777-b72e-48575bd497e9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_aba76ca2-3934-41df-9460-027f88f30f1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_5419d3e0-096d-4535-a672-d92a1d6ec912" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_aba76ca2-3934-41df-9460-027f88f30f1c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_aba76ca2-3934-41df-9460-027f88f30f1c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_aba76ca2-3934-41df-9460-027f88f30f1c" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_aba76ca2-3934-41df-9460-027f88f30f1c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_87f33127-b76f-4a65-881e-58d88607f3f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_aba76ca2-3934-41df-9460-027f88f30f1c" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_87f33127-b76f-4a65-881e-58d88607f3f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_3a699885-08f3-444a-8db2-25e3998f11fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_87f33127-b76f-4a65-881e-58d88607f3f9" xlink:to="loc_us-gaap_SecuredDebtMember_3a699885-08f3-444a-8db2-25e3998f11fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_e861ec2b-626f-4001-9396-1dc3ff491602" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_87f33127-b76f-4a65-881e-58d88607f3f9" xlink:to="loc_us-gaap_LineOfCreditMember_e861ec2b-626f-4001-9396-1dc3ff491602" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_3b3cd0e0-fa17-453c-a808-f90d28cab447" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_5419d3e0-096d-4535-a672-d92a1d6ec912" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_3b3cd0e0-fa17-453c-a808-f90d28cab447" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_3b3cd0e0-fa17-453c-a808-f90d28cab447_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_3b3cd0e0-fa17-453c-a808-f90d28cab447" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_3b3cd0e0-fa17-453c-a808-f90d28cab447_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_48b90bce-d92d-42b9-88e4-cc7ad9826f93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_3b3cd0e0-fa17-453c-a808-f90d28cab447" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_48b90bce-d92d-42b9-88e4-cc7ad9826f93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_44a52971-48a6-4938-bd29-fe14f3d1b8a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_48b90bce-d92d-42b9-88e4-cc7ad9826f93" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_44a52971-48a6-4938-bd29-fe14f3d1b8a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_3f2adb00-e270-4eb3-ac59-a6f853feb41c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_44a52971-48a6-4938-bd29-fe14f3d1b8a5" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_3f2adb00-e270-4eb3-ac59-a6f853feb41c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_28ceda19-fca1-48a4-ab1d-2a331cc6b323" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_5419d3e0-096d-4535-a672-d92a1d6ec912" xlink:to="loc_srt_OwnershipAxis_28ceda19-fca1-48a4-ab1d-2a331cc6b323" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_28ceda19-fca1-48a4-ab1d-2a331cc6b323_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_28ceda19-fca1-48a4-ab1d-2a331cc6b323" xlink:to="loc_srt_OwnershipDomain_28ceda19-fca1-48a4-ab1d-2a331cc6b323_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_f0d9823c-0e9c-45a2-a7a9-c3f09b841273" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_28ceda19-fca1-48a4-ab1d-2a331cc6b323" xlink:to="loc_srt_OwnershipDomain_f0d9823c-0e9c-45a2-a7a9-c3f09b841273" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_CommercialStrategiesMember_2ea3908a-c3fb-45c7-8619-8fbd43235d3a" xlink:href="byon-20250930.xsd#byon_CommercialStrategiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_f0d9823c-0e9c-45a2-a7a9-c3f09b841273" xlink:to="loc_byon_CommercialStrategiesMember_2ea3908a-c3fb-45c7-8619-8fbd43235d3a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_ZionPeaksInc.Member_be92bbaa-277a-405e-8f6d-e56c640838f7" xlink:href="byon-20250930.xsd#byon_ZionPeaksInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_f0d9823c-0e9c-45a2-a7a9-c3f09b841273" xlink:to="loc_byon_ZionPeaksInc.Member_be92bbaa-277a-405e-8f6d-e56c640838f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_NoncontrollingInterestCumulativeProceedsFromTokenOffering_f0a6405a-0f73-4450-8cbb-5bf0b13fba16" xlink:href="byon-20250930.xsd#byon_NoncontrollingInterestCumulativeProceedsFromTokenOffering"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_555723e2-980c-4423-8a1c-3415f2b6f843" xlink:to="loc_byon_NoncontrollingInterestCumulativeProceedsFromTokenOffering_f0a6405a-0f73-4450-8cbb-5bf0b13fba16" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_StockIssuanceCostsIncurred_9819a61a-9e79-4031-a4a3-7a97677fd7f2" xlink:href="byon-20250930.xsd#byon_StockIssuanceCostsIncurred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_555723e2-980c-4423-8a1c-3415f2b6f843" xlink:to="loc_byon_StockIssuanceCostsIncurred_9819a61a-9e79-4031-a4a3-7a97677fd7f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_4fc65b0b-fe9e-4f3d-9219-9b747a1dd25d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_555723e2-980c-4423-8a1c-3415f2b6f843" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_4fc65b0b-fe9e-4f3d-9219-9b747a1dd25d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_ca87bf2b-8115-4e77-b2fd-8467c809e337" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_555723e2-980c-4423-8a1c-3415f2b6f843" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_ca87bf2b-8115-4e77-b2fd-8467c809e337" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_DebtInstrumentConvertiblePercentageOfOutstandingCommonShares_636f1035-0e88-4eab-89bf-470d716e5c28" xlink:href="byon-20250930.xsd#byon_DebtInstrumentConvertiblePercentageOfOutstandingCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_555723e2-980c-4423-8a1c-3415f2b6f843" xlink:to="loc_byon_DebtInstrumentConvertiblePercentageOfOutstandingCommonShares_636f1035-0e88-4eab-89bf-470d716e5c28" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_DebtInstrumentCovenantPercentOfOutstandingSharesMaximum_b2a2052d-3c6d-4ff8-9a6f-4a48c3ed9b16" xlink:href="byon-20250930.xsd#byon_DebtInstrumentCovenantPercentOfOutstandingSharesMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_555723e2-980c-4423-8a1c-3415f2b6f843" xlink:to="loc_byon_DebtInstrumentCovenantPercentOfOutstandingSharesMaximum_b2a2052d-3c6d-4ff8-9a6f-4a48c3ed9b16" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_8b052aa1-350f-4c37-ac6a-89a10d81c154" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_555723e2-980c-4423-8a1c-3415f2b6f843" xlink:to="loc_us-gaap_LongTermDebtFairValue_8b052aa1-350f-4c37-ac6a-89a10d81c154" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_UnrealizedGainLossOnDebtInstrumentNet_bdb2384a-268d-40eb-ab9e-b6d1b53da4ff" xlink:href="byon-20250930.xsd#byon_UnrealizedGainLossOnDebtInstrumentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_555723e2-980c-4423-8a1c-3415f2b6f843" xlink:to="loc_byon_UnrealizedGainLossOnDebtInstrumentNet_bdb2384a-268d-40eb-ab9e-b6d1b53da4ff" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/FAIRVALUEMEASUREMENTAssetsandLiabilitiesMeasuredAtFairValueDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#FAIRVALUEMEASUREMENTAssetsandLiabilitiesMeasuredAtFairValueDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/FAIRVALUEMEASUREMENTAssetsandLiabilitiesMeasuredAtFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a949ec81-a82e-4524-be53-87fd4b8e2970" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_250d0cce-a238-456b-ab92-b4b8cbbd3186" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a949ec81-a82e-4524-be53-87fd4b8e2970" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_250d0cce-a238-456b-ab92-b4b8cbbd3186" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_46956f2c-3242-4c6a-8877-fc6359c0989e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_250d0cce-a238-456b-ab92-b4b8cbbd3186" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_46956f2c-3242-4c6a-8877-fc6359c0989e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_46956f2c-3242-4c6a-8877-fc6359c0989e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_46956f2c-3242-4c6a-8877-fc6359c0989e" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_46956f2c-3242-4c6a-8877-fc6359c0989e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ea11bc26-051d-47c6-bea5-1fb232e3c83a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_46956f2c-3242-4c6a-8877-fc6359c0989e" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ea11bc26-051d-47c6-bea5-1fb232e3c83a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_26bb4574-e3e3-4557-ae08-ddbfd9f94e14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ea11bc26-051d-47c6-bea5-1fb232e3c83a" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_26bb4574-e3e3-4557-ae08-ddbfd9f94e14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_235c5beb-2d31-4293-91e4-a2625015aec8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ea11bc26-051d-47c6-bea5-1fb232e3c83a" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_235c5beb-2d31-4293-91e4-a2625015aec8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_60bd5212-93ae-4882-9437-02b1fb79c85d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ea11bc26-051d-47c6-bea5-1fb232e3c83a" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_60bd5212-93ae-4882-9437-02b1fb79c85d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_2b40453b-b830-47e1-b516-302fa6334468" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a949ec81-a82e-4524-be53-87fd4b8e2970" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_2b40453b-b830-47e1-b516-302fa6334468" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_b55cf236-a2ed-46fe-bb89-18f786e37f0f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_2b40453b-b830-47e1-b516-302fa6334468" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_b55cf236-a2ed-46fe-bb89-18f786e37f0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_7cd255ad-40da-419f-b54e-31ca2c3b2080" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_2b40453b-b830-47e1-b516-302fa6334468" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_7cd255ad-40da-419f-b54e-31ca2c3b2080" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_ec72d756-0939-4ea3-91ab-b5a3edc74099" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_2b40453b-b830-47e1-b516-302fa6334468" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_ec72d756-0939-4ea3-91ab-b5a3edc74099" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableFairValueDisclosure_74e9635c-48d2-40ce-a0b7-85ea1eb28a28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_2b40453b-b830-47e1-b516-302fa6334468" xlink:to="loc_us-gaap_LoansReceivableFairValueDisclosure_74e9635c-48d2-40ce-a0b7-85ea1eb28a28" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_3617e76e-089a-401d-a0bf-665c7cbaddc0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_2b40453b-b830-47e1-b516-302fa6334468" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_3617e76e-089a-401d-a0bf-665c7cbaddc0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_0992dbc7-a7be-40fa-98eb-c60c3c80560f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a949ec81-a82e-4524-be53-87fd4b8e2970" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_0992dbc7-a7be-40fa-98eb-c60c3c80560f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsFairValueDisclosure_e05ea62b-d4af-481e-b2bf-e6f34277be4a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_0992dbc7-a7be-40fa-98eb-c60c3c80560f" xlink:to="loc_us-gaap_CommitmentsFairValueDisclosure_e05ea62b-d4af-481e-b2bf-e6f34277be4a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_f5a2f492-9d72-4d6f-a5a2-a7e89a97807f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_0992dbc7-a7be-40fa-98eb-c60c3c80560f" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_f5a2f492-9d72-4d6f-a5a2-a7e89a97807f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/FAIRVALUEMEASUREMENTLevel3InvestmentActivityDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#FAIRVALUEMEASUREMENTLevel3InvestmentActivityDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/FAIRVALUEMEASUREMENTLevel3InvestmentActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_3d362c9c-b0de-4e93-a472-668702aeed5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_45f56fbe-ef04-4f25-be4c-3fb5961ff796" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_3d362c9c-b0de-4e93-a472-668702aeed5b" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_45f56fbe-ef04-4f25-be4c-3fb5961ff796" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_847f2d99-843d-416e-aabf-17e55961557a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_45f56fbe-ef04-4f25-be4c-3fb5961ff796" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_847f2d99-843d-416e-aabf-17e55961557a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_847f2d99-843d-416e-aabf-17e55961557a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_847f2d99-843d-416e-aabf-17e55961557a" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_847f2d99-843d-416e-aabf-17e55961557a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c8912906-0b0f-4a34-96e0-ec1a74f34a27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_847f2d99-843d-416e-aabf-17e55961557a" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c8912906-0b0f-4a34-96e0-ec1a74f34a27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_cb14e21c-0d5d-47dc-aa68-45243d6c0971" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c8912906-0b0f-4a34-96e0-ec1a74f34a27" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_cb14e21c-0d5d-47dc-aa68-45243d6c0971" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_869e2f24-49c4-4ffa-94c8-5f505e0584f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_3d362c9c-b0de-4e93-a472-668702aeed5b" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_869e2f24-49c4-4ffa-94c8-5f505e0584f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_51cf6a73-e9ed-4df2-bd0a-9ace72bcea4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_869e2f24-49c4-4ffa-94c8-5f505e0584f0" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_51cf6a73-e9ed-4df2-bd0a-9ace72bcea4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_3abee5d7-1950-46b6-880b-85080d6bb076" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_869e2f24-49c4-4ffa-94c8-5f505e0584f0" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_3abee5d7-1950-46b6-880b-85080d6bb076" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_271f077d-5864-489f-aa57-ef1e3031b368" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_869e2f24-49c4-4ffa-94c8-5f505e0584f0" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_271f077d-5864-489f-aa57-ef1e3031b368" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_efb11144-397e-47f7-a6e8-495d1971d07e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_869e2f24-49c4-4ffa-94c8-5f505e0584f0" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_efb11144-397e-47f7-a6e8-495d1971d07e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAccruedInterest_5574c026-5495-4907-ac32-b8d0bc999597" xlink:href="byon-20250930.xsd#byon_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_869e2f24-49c4-4ffa-94c8-5f505e0584f0" xlink:to="loc_byon_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAccruedInterest_5574c026-5495-4907-ac32-b8d0bc999597" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_1876b58c-2bc3-4737-a8af-4739b3a7797e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/FAIRVALUEMEASUREMENTLevel3LiabilityActivityDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#FAIRVALUEMEASUREMENTLevel3LiabilityActivityDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/FAIRVALUEMEASUREMENTLevel3LiabilityActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_8a0c66fa-29ec-492b-aa16-60bd19764fb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_c09e48c3-25b6-4485-9bf0-2a5257585d88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_8a0c66fa-29ec-492b-aa16-60bd19764fb8" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_c09e48c3-25b6-4485-9bf0-2a5257585d88" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_7050917f-3683-4de9-bd88-39bfe53fca46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_c09e48c3-25b6-4485-9bf0-2a5257585d88" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_7050917f-3683-4de9-bd88-39bfe53fca46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7050917f-3683-4de9-bd88-39bfe53fca46_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_7050917f-3683-4de9-bd88-39bfe53fca46" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7050917f-3683-4de9-bd88-39bfe53fca46_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8b7925f0-4b6b-4137-9fef-983443ad0268" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_7050917f-3683-4de9-bd88-39bfe53fca46" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8b7925f0-4b6b-4137-9fef-983443ad0268" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_635740c1-e016-49cf-a9e6-24f9f8fd7327" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8b7925f0-4b6b-4137-9fef-983443ad0268" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_635740c1-e016-49cf-a9e6-24f9f8fd7327" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_34dce1de-1038-4a66-9730-3f6d348baf8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_8a0c66fa-29ec-492b-aa16-60bd19764fb8" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_34dce1de-1038-4a66-9730-3f6d348baf8c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_ac1d56c0-a047-429a-85a7-c16e4bfcaa3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_34dce1de-1038-4a66-9730-3f6d348baf8c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_ac1d56c0-a047-429a-85a7-c16e4bfcaa3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_b38e0d60-d0d6-4baf-8d16-2445db6b9879" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_34dce1de-1038-4a66-9730-3f6d348baf8c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_b38e0d60-d0d6-4baf-8d16-2445db6b9879" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_ff70a1eb-33e6-42de-8205-3da371d75ed1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/PROPERTYANDEQUIPMENTNETDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#PROPERTYANDEQUIPMENTNETDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/PROPERTYANDEQUIPMENTNETDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b7da2cd3-ae60-4979-b612-b077a0ba1b2b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1e9da553-98f3-49db-ab57-e8457e2d0284" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b7da2cd3-ae60-4979-b612-b077a0ba1b2b" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1e9da553-98f3-49db-ab57-e8457e2d0284" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ff91911d-265f-4a71-8bb8-4504c2702810" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1e9da553-98f3-49db-ab57-e8457e2d0284" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ff91911d-265f-4a71-8bb8-4504c2702810" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ff91911d-265f-4a71-8bb8-4504c2702810_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ff91911d-265f-4a71-8bb8-4504c2702810" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ff91911d-265f-4a71-8bb8-4504c2702810_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_adf5f513-4337-476c-8caa-6250c05c306b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ff91911d-265f-4a71-8bb8-4504c2702810" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_adf5f513-4337-476c-8caa-6250c05c306b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_ComputerHardwareandSoftwareMember_b3b92ffb-cba7-4544-a92b-5eeb291c00c1" xlink:href="byon-20250930.xsd#byon_ComputerHardwareandSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_adf5f513-4337-476c-8caa-6250c05c306b" xlink:to="loc_byon_ComputerHardwareandSoftwareMember_b3b92ffb-cba7-4544-a92b-5eeb291c00c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_FurnitureAndEquipmentMember_9517aa7f-92ee-440d-882e-b4c48d515f4d" xlink:href="byon-20250930.xsd#byon_FurnitureAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_adf5f513-4337-476c-8caa-6250c05c306b" xlink:to="loc_byon_FurnitureAndEquipmentMember_9517aa7f-92ee-440d-882e-b4c48d515f4d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_1fe34072-459f-42fb-8354-3d5d906137fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_adf5f513-4337-476c-8caa-6250c05c306b" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_1fe34072-459f-42fb-8354-3d5d906137fb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_23875a98-6785-4cc6-a718-65f5be4194f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b7da2cd3-ae60-4979-b612-b077a0ba1b2b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_23875a98-6785-4cc6-a718-65f5be4194f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_d8ba7ef2-21f1-4c36-b88b-57507286ea91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b7da2cd3-ae60-4979-b612-b077a0ba1b2b" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_d8ba7ef2-21f1-4c36-b88b-57507286ea91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_c4c2f230-94a6-4a5c-a727-b08bb6cc7075" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b7da2cd3-ae60-4979-b612-b077a0ba1b2b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_c4c2f230-94a6-4a5c-a727-b08bb6cc7075" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/PROPERTYANDEQUIPMENTNETCapitalizedSoftwareWebsiteDevelopmentDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#PROPERTYANDEQUIPMENTNETCapitalizedSoftwareWebsiteDevelopmentDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/PROPERTYANDEQUIPMENTNETCapitalizedSoftwareWebsiteDevelopmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_53359944-0fef-4a0c-a1f1-9a4a926fa3d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_b256732c-5c14-484c-a658-80f1ee264f5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_53359944-0fef-4a0c-a1f1-9a4a926fa3d8" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_b256732c-5c14-484c-a658-80f1ee264f5c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_77912896-3c0c-4d69-a70b-8a35008ba981" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_b256732c-5c14-484c-a658-80f1ee264f5c" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_77912896-3c0c-4d69-a70b-8a35008ba981" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_77912896-3c0c-4d69-a70b-8a35008ba981_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_77912896-3c0c-4d69-a70b-8a35008ba981" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_77912896-3c0c-4d69-a70b-8a35008ba981_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ec390c08-e652-46b5-847f-b5c9c28dbe95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_77912896-3c0c-4d69-a70b-8a35008ba981" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ec390c08-e652-46b5-847f-b5c9c28dbe95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_ac7c83d5-2f20-4909-b5e5-6880db3d2b85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ec390c08-e652-46b5-847f-b5c9c28dbe95" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_ac7c83d5-2f20-4909-b5e5-6880db3d2b85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareAdditions_55dd55cd-3001-445d-8515-8a52a41696c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalizedComputerSoftwareAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_53359944-0fef-4a0c-a1f1-9a4a926fa3d8" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareAdditions_55dd55cd-3001-445d-8515-8a52a41696c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_a85ff358-f4bc-4416-9aeb-5b1bf5f8b18e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalizedComputerSoftwareAmortization1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_53359944-0fef-4a0c-a1f1-9a4a926fa3d8" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_a85ff358-f4bc-4416-9aeb-5b1bf5f8b18e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/PROPERTYANDEQUIPMENTNETDepreciationExpenseDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#PROPERTYANDEQUIPMENTNETDepreciationExpenseDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/PROPERTYANDEQUIPMENTNETDepreciationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_051a398b-fdbc-4301-b9e5-97a7e3e90c0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_a26a7861-2332-4ee6-8b24-7140fb040e4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_051a398b-fdbc-4301-b9e5-97a7e3e90c0e" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_a26a7861-2332-4ee6-8b24-7140fb040e4f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_5eb3a354-c28f-444a-9aa4-e9d7eb694a39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_a26a7861-2332-4ee6-8b24-7140fb040e4f" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_5eb3a354-c28f-444a-9aa4-e9d7eb694a39" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_5eb3a354-c28f-444a-9aa4-e9d7eb694a39_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_5eb3a354-c28f-444a-9aa4-e9d7eb694a39" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_5eb3a354-c28f-444a-9aa4-e9d7eb694a39_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_c23da75a-8c1f-4d29-b29e-72b5193646a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_5eb3a354-c28f-444a-9aa4-e9d7eb694a39" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_c23da75a-8c1f-4d29-b29e-72b5193646a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_2058324a-1584-4156-b37c-b92df350d443" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c23da75a-8c1f-4d29-b29e-72b5193646a3" xlink:to="loc_us-gaap_CostOfSalesMember_2058324a-1584-4156-b37c-b92df350d443" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_TechnologyMember_792eefa3-4695-472b-99ae-d6bde926ba04" xlink:href="byon-20250930.xsd#byon_TechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c23da75a-8c1f-4d29-b29e-72b5193646a3" xlink:to="loc_byon_TechnologyMember_792eefa3-4695-472b-99ae-d6bde926ba04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_82c99f69-32fb-4b27-bf14-a6dcca424ff4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c23da75a-8c1f-4d29-b29e-72b5193646a3" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_82c99f69-32fb-4b27-bf14-a6dcca424ff4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_c5f6e15d-8355-4bcd-9dc8-90d2f6f2fe52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_051a398b-fdbc-4301-b9e5-97a7e3e90c0e" xlink:to="loc_us-gaap_Depreciation_c5f6e15d-8355-4bcd-9dc8-90d2f6f2fe52" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/INTANGIBLEASSETSNETNarrativeDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#INTANGIBLEASSETSNETNarrativeDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/INTANGIBLEASSETSNETNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_8ecdd8c3-dae5-4ebb-8176-431d70be2248" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_2e22d541-97ca-4e48-b54f-7dd04b60ba7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_8ecdd8c3-dae5-4ebb-8176-431d70be2248" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_2e22d541-97ca-4e48-b54f-7dd04b60ba7c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_73e188e5-6701-4d4b-b91d-478b6419f861" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_2e22d541-97ca-4e48-b54f-7dd04b60ba7c" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_73e188e5-6701-4d4b-b91d-478b6419f861" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_73e188e5-6701-4d4b-b91d-478b6419f861_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_73e188e5-6701-4d4b-b91d-478b6419f861" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_73e188e5-6701-4d4b-b91d-478b6419f861_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_1135944b-3c89-43ae-98ff-460fee0f4d01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_73e188e5-6701-4d4b-b91d-478b6419f861" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_1135944b-3c89-43ae-98ff-460fee0f4d01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_6852e680-3955-44d8-84fc-791ec79b6a80" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_1135944b-3c89-43ae-98ff-460fee0f4d01" xlink:to="loc_us-gaap_TradeNamesMember_6852e680-3955-44d8-84fc-791ec79b6a80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionAxis_0d83f812-6227-4187-9f54-c0760d55d873" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_2e22d541-97ca-4e48-b54f-7dd04b60ba7c" xlink:to="loc_us-gaap_AssetAcquisitionAxis_0d83f812-6227-4187-9f54-c0760d55d873" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionDomain_0d83f812-6227-4187-9f54-c0760d55d873_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetAcquisitionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AssetAcquisitionAxis_0d83f812-6227-4187-9f54-c0760d55d873" xlink:to="loc_us-gaap_AssetAcquisitionDomain_0d83f812-6227-4187-9f54-c0760d55d873_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionDomain_9f2d4776-f855-4a6a-99b5-6f73f05a4da6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetAcquisitionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AssetAcquisitionAxis_0d83f812-6227-4187-9f54-c0760d55d873" xlink:to="loc_us-gaap_AssetAcquisitionDomain_9f2d4776-f855-4a6a-99b5-6f73f05a4da6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_BuyBuyBabyAssetsMember_d59497ca-6fa6-4cb7-b0d7-bbcbb6224baf" xlink:href="byon-20250930.xsd#byon_BuyBuyBabyAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetAcquisitionDomain_9f2d4776-f855-4a6a-99b5-6f73f05a4da6" xlink:to="loc_byon_BuyBuyBabyAssetsMember_d59497ca-6fa6-4cb7-b0d7-bbcbb6224baf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_KirklandsBrandAssetsMember_4a4bd125-3a32-40a6-b9d1-c01a0c7aaa18" xlink:href="byon-20250930.xsd#byon_KirklandsBrandAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetAcquisitionDomain_9f2d4776-f855-4a6a-99b5-6f73f05a4da6" xlink:to="loc_byon_KirklandsBrandAssetsMember_4a4bd125-3a32-40a6-b9d1-c01a0c7aaa18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_7a15f8d8-f1c8-499c-8ad8-86d4f0726529" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_2e22d541-97ca-4e48-b54f-7dd04b60ba7c" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_7a15f8d8-f1c8-499c-8ad8-86d4f0726529" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_7a15f8d8-f1c8-499c-8ad8-86d4f0726529_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_7a15f8d8-f1c8-499c-8ad8-86d4f0726529" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_7a15f8d8-f1c8-499c-8ad8-86d4f0726529_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_c3b53242-8c42-496c-abda-fa9e7c15020d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_7a15f8d8-f1c8-499c-8ad8-86d4f0726529" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_c3b53242-8c42-496c-abda-fa9e7c15020d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_e3d8616e-7006-4352-a7e0-8dbd9de339da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_c3b53242-8c42-496c-abda-fa9e7c15020d" xlink:to="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_e3d8616e-7006-4352-a7e0-8dbd9de339da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_7361b842-3bf6-461a-88f9-81d3461cd6d7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_2e22d541-97ca-4e48-b54f-7dd04b60ba7c" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_7361b842-3bf6-461a-88f9-81d3461cd6d7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_7361b842-3bf6-461a-88f9-81d3461cd6d7_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_7361b842-3bf6-461a-88f9-81d3461cd6d7" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_7361b842-3bf6-461a-88f9-81d3461cd6d7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_c30f094b-4b1d-4dcb-9247-4cbc601dd329" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_7361b842-3bf6-461a-88f9-81d3461cd6d7" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_c30f094b-4b1d-4dcb-9247-4cbc601dd329" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_ZulilyNewcoMember_bd100365-e117-4ccb-b5b5-7a5140f2bbda" xlink:href="byon-20250930.xsd#byon_ZulilyNewcoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_c30f094b-4b1d-4dcb-9247-4cbc601dd329" xlink:to="loc_byon_ZulilyNewcoMember_bd100365-e117-4ccb-b5b5-7a5140f2bbda" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_0b307445-6f85-44f3-8de2-d524186d846d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_2e22d541-97ca-4e48-b54f-7dd04b60ba7c" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_0b307445-6f85-44f3-8de2-d524186d846d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_0b307445-6f85-44f3-8de2-d524186d846d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_0b307445-6f85-44f3-8de2-d524186d846d" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_0b307445-6f85-44f3-8de2-d524186d846d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_365c2e11-d229-47c2-a44e-8151c941ebc0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_0b307445-6f85-44f3-8de2-d524186d846d" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_365c2e11-d229-47c2-a44e-8151c941ebc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_LyonsTradingCompanyAssetsMember_61168e29-ce2c-4908-a039-1ed6f23c1c41" xlink:href="byon-20250930.xsd#byon_LyonsTradingCompanyAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_365c2e11-d229-47c2-a44e-8151c941ebc0" xlink:to="loc_byon_LyonsTradingCompanyAssetsMember_61168e29-ce2c-4908-a039-1ed6f23c1c41" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_BedBathBeyondTrademarkAssetsMember_be4ff849-0e1e-49b7-971f-9968e13ee48c" xlink:href="byon-20250930.xsd#byon_BedBathBeyondTrademarkAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_365c2e11-d229-47c2-a44e-8151c941ebc0" xlink:to="loc_byon_BedBathBeyondTrademarkAssetsMember_be4ff849-0e1e-49b7-971f-9968e13ee48c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionConsiderationTransferred_97c18e12-9039-4c81-baac-3a57f72c4845" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetAcquisitionConsiderationTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_8ecdd8c3-dae5-4ebb-8176-431d70be2248" xlink:to="loc_us-gaap_AssetAcquisitionConsiderationTransferred_97c18e12-9039-4c81-baac-3a57f72c4845" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefinitelivedIntangibleAssetsAcquired_97426ad1-74ff-4296-90ce-74870c70d1a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefinitelivedIntangibleAssetsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_8ecdd8c3-dae5-4ebb-8176-431d70be2248" xlink:to="loc_us-gaap_IndefinitelivedIntangibleAssetsAcquired_97426ad1-74ff-4296-90ce-74870c70d1a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_8cb199ae-35f6-4e03-9ab8-45ae643920d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_8ecdd8c3-dae5-4ebb-8176-431d70be2248" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_8cb199ae-35f6-4e03-9ab8-45ae643920d6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_9f3f6078-b2d2-441e-bdc3-7ddb7944e418" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_8ecdd8c3-dae5-4ebb-8176-431d70be2248" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_9f3f6078-b2d2-441e-bdc3-7ddb7944e418" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfIntangibleAssets_274b9a34-97b4-46e3-9cd9-a26f605610f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_8ecdd8c3-dae5-4ebb-8176-431d70be2248" xlink:to="loc_us-gaap_ProceedsFromSaleOfIntangibleAssets_274b9a34-97b4-46e3-9cd9-a26f605610f8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_DisposalGroupIncludingDiscontinuedOperationConsiderationReceivable_178f8751-a47b-426a-bdb1-01b5cd54d854" xlink:href="byon-20250930.xsd#byon_DisposalGroupIncludingDiscontinuedOperationConsiderationReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_8ecdd8c3-dae5-4ebb-8176-431d70be2248" xlink:to="loc_byon_DisposalGroupIncludingDiscontinuedOperationConsiderationReceivable_178f8751-a47b-426a-bdb1-01b5cd54d854" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_DisposalGroupIncludingDiscontinuedOperationConsiderationReceivableInstallmentPeriod_21d460d8-4de3-4c07-bfde-2c47a0ab8005" xlink:href="byon-20250930.xsd#byon_DisposalGroupIncludingDiscontinuedOperationConsiderationReceivableInstallmentPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_8ecdd8c3-dae5-4ebb-8176-431d70be2248" xlink:to="loc_byon_DisposalGroupIncludingDiscontinuedOperationConsiderationReceivableInstallmentPeriod_21d460d8-4de3-4c07-bfde-2c47a0ab8005" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_a8fb90fc-e023-4896-94c8-0ed07ca4e7ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_8ecdd8c3-dae5-4ebb-8176-431d70be2248" xlink:to="loc_us-gaap_EquityMethodInvestments_a8fb90fc-e023-4896-94c8-0ed07ca4e7ac" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_4845c243-e61f-4530-9827-09e2b9c723f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_8ecdd8c3-dae5-4ebb-8176-431d70be2248" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_4845c243-e61f-4530-9827-09e2b9c723f7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_AssetAcquisitionConsiderationTransferredNoncashConsideration_914fde01-083a-4a4b-851b-79c60287a39e" xlink:href="byon-20250930.xsd#byon_AssetAcquisitionConsiderationTransferredNoncashConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_8ecdd8c3-dae5-4ebb-8176-431d70be2248" xlink:to="loc_byon_AssetAcquisitionConsiderationTransferredNoncashConsideration_914fde01-083a-4a4b-851b-79c60287a39e" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/EQUITYSECURITIESNarrativeDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#EQUITYSECURITIESNarrativeDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/EQUITYSECURITIESNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7d3ae394-2498-4473-a774-b171764172a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_596ad2be-e24a-428d-9b81-a09b4b6a12fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7d3ae394-2498-4473-a774-b171764172a8" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_596ad2be-e24a-428d-9b81-a09b4b6a12fe" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_b29f6435-c29f-436b-92e2-4a17a14c3c70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_596ad2be-e24a-428d-9b81-a09b4b6a12fe" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_b29f6435-c29f-436b-92e2-4a17a14c3c70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_b29f6435-c29f-436b-92e2-4a17a14c3c70_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_b29f6435-c29f-436b-92e2-4a17a14c3c70" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_b29f6435-c29f-436b-92e2-4a17a14c3c70_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_e371cc00-2126-4590-8dcd-e483a29a8e8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_b29f6435-c29f-436b-92e2-4a17a14c3c70" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_e371cc00-2126-4590-8dcd-e483a29a8e8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_45686aeb-a0eb-4667-bac6-05ca0a8c7af4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_e371cc00-2126-4590-8dcd-e483a29a8e8a" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_45686aeb-a0eb-4667-bac6-05ca0a8c7af4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_83d68eef-a113-4906-bfa7-c6e5abeb4645" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_596ad2be-e24a-428d-9b81-a09b4b6a12fe" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_83d68eef-a113-4906-bfa7-c6e5abeb4645" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_83d68eef-a113-4906-bfa7-c6e5abeb4645_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_83d68eef-a113-4906-bfa7-c6e5abeb4645" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_83d68eef-a113-4906-bfa7-c6e5abeb4645_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_baa05737-4b2e-4793-ba9c-356a71105426" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_83d68eef-a113-4906-bfa7-c6e5abeb4645" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_baa05737-4b2e-4793-ba9c-356a71105426" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_TheBrandHouseCollectiveInc.Member_d8921a89-cc01-41dc-90f2-ece252130e56" xlink:href="byon-20250930.xsd#byon_TheBrandHouseCollectiveInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_baa05737-4b2e-4793-ba9c-356a71105426" xlink:to="loc_byon_TheBrandHouseCollectiveInc.Member_d8921a89-cc01-41dc-90f2-ece252130e56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_ZulilyNewcoMember_ff123018-ec56-4914-8397-9f517a992506" xlink:href="byon-20250930.xsd#byon_ZulilyNewcoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_baa05737-4b2e-4793-ba9c-356a71105426" xlink:to="loc_byon_ZulilyNewcoMember_ff123018-ec56-4914-8397-9f517a992506" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_1b668901-c8d0-45ed-904e-c47b52788164" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7d3ae394-2498-4473-a774-b171764172a8" xlink:to="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_1b668901-c8d0-45ed-904e-c47b52788164" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtConversionConvertedInstrumentAmount1_2af14e65-531a-4df5-9436-73f1504a1ab3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtConversionConvertedInstrumentAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7d3ae394-2498-4473-a774-b171764172a8" xlink:to="loc_us-gaap_DebtConversionConvertedInstrumentAmount1_2af14e65-531a-4df5-9436-73f1504a1ab3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_32c1c9ce-e06a-4db0-a797-01fac3708e9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7d3ae394-2498-4473-a774-b171764172a8" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_32c1c9ce-e06a-4db0-a797-01fac3708e9d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermInvestments_4fee2eae-09b7-4416-b452-2e6408cdd5d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7d3ae394-2498-4473-a774-b171764172a8" xlink:to="loc_us-gaap_LongTermInvestments_4fee2eae-09b7-4416-b452-2e6408cdd5d7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFVNINoncurrent_4151bfdb-36dc-463b-84a1-4ec5b27d92f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFVNINoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7d3ae394-2498-4473-a774-b171764172a8" xlink:to="loc_us-gaap_EquitySecuritiesFVNINoncurrent_4151bfdb-36dc-463b-84a1-4ec5b27d92f6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_532238f3-aae3-481b-ab46-192c53834a92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_7d3ae394-2498-4473-a774-b171764172a8" xlink:to="loc_us-gaap_EquityMethodInvestments_532238f3-aae3-481b-ab46-192c53834a92" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/EQUITYSECURITIESEquitySecuritiesaccountedforUnderEquityMethodandRelatedOwnershipInterestDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#EQUITYSECURITIESEquitySecuritiesaccountedforUnderEquityMethodandRelatedOwnershipInterestDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/EQUITYSECURITIESEquitySecuritiesaccountedforUnderEquityMethodandRelatedOwnershipInterestDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_e15b3b33-33e1-450c-bc8c-d1743ce015f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_8946ee55-9e36-4c63-8123-701f3154d658" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_e15b3b33-33e1-450c-bc8c-d1743ce015f1" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_8946ee55-9e36-4c63-8123-701f3154d658" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_d2f08b0b-fab5-481c-9867-b5f41d4d5dc8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_8946ee55-9e36-4c63-8123-701f3154d658" xlink:to="loc_srt_OwnershipAxis_d2f08b0b-fab5-481c-9867-b5f41d4d5dc8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_d2f08b0b-fab5-481c-9867-b5f41d4d5dc8_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_d2f08b0b-fab5-481c-9867-b5f41d4d5dc8" xlink:to="loc_srt_OwnershipDomain_d2f08b0b-fab5-481c-9867-b5f41d4d5dc8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_314ace8c-7923-4b3b-9444-00f9ecbbd9a0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_d2f08b0b-fab5-481c-9867-b5f41d4d5dc8" xlink:to="loc_srt_OwnershipDomain_314ace8c-7923-4b3b-9444-00f9ecbbd9a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_MediciVenturesLPMember_24a65f95-f0df-4947-a6c7-7b3eb3a09bed" xlink:href="byon-20250930.xsd#byon_MediciVenturesLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_314ace8c-7923-4b3b-9444-00f9ecbbd9a0" xlink:to="loc_byon_MediciVenturesLPMember_24a65f95-f0df-4947-a6c7-7b3eb3a09bed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_30e235f7-d724-45ab-9d30-a53be6769ea7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_8946ee55-9e36-4c63-8123-701f3154d658" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_30e235f7-d724-45ab-9d30-a53be6769ea7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_30e235f7-d724-45ab-9d30-a53be6769ea7_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_30e235f7-d724-45ab-9d30-a53be6769ea7" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_30e235f7-d724-45ab-9d30-a53be6769ea7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_d0d073f8-e470-4104-9f29-0711f8d77093" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_30e235f7-d724-45ab-9d30-a53be6769ea7" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_d0d073f8-e470-4104-9f29-0711f8d77093" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_TZero.comInc.Member_ac125509-626e-40fd-83ba-5d9900861530" xlink:href="byon-20250930.xsd#byon_TZero.comInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_d0d073f8-e470-4104-9f29-0711f8d77093" xlink:to="loc_byon_TZero.comInc.Member_ac125509-626e-40fd-83ba-5d9900861530" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_TheBrandHouseCollectiveInc.Member_5730fd80-37ac-4843-9549-e4ab8f4d0e32" xlink:href="byon-20250930.xsd#byon_TheBrandHouseCollectiveInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_d0d073f8-e470-4104-9f29-0711f8d77093" xlink:to="loc_byon_TheBrandHouseCollectiveInc.Member_5730fd80-37ac-4843-9549-e4ab8f4d0e32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_ZulilyNewcoMember_41cce3d0-8d8f-4f9a-9943-a3d7a1e99986" xlink:href="byon-20250930.xsd#byon_ZulilyNewcoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_d0d073f8-e470-4104-9f29-0711f8d77093" xlink:to="loc_byon_ZulilyNewcoMember_41cce3d0-8d8f-4f9a-9943-a3d7a1e99986" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_d0c05bc1-d3b9-4944-a999-b6996e6139f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_e15b3b33-33e1-450c-bc8c-d1743ce015f1" xlink:to="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_d0c05bc1-d3b9-4944-a999-b6996e6139f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_df5a5303-d9d1-40ab-bcd3-4283cbd81077" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_e15b3b33-33e1-450c-bc8c-d1743ce015f1" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_df5a5303-d9d1-40ab-bcd3-4283cbd81077" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/BORROWINGSDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#BORROWINGSDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/BORROWINGSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_931672cd-6818-4d24-8c38-d790edced4d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_d5b61150-4acf-4f51-b266-fd990a56e0c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_931672cd-6818-4d24-8c38-d790edced4d2" xlink:to="loc_us-gaap_DebtInstrumentTable_d5b61150-4acf-4f51-b266-fd990a56e0c4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_70bd16fa-d921-4f88-9cd4-f09c29e29be0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_d5b61150-4acf-4f51-b266-fd990a56e0c4" xlink:to="loc_us-gaap_DebtInstrumentAxis_70bd16fa-d921-4f88-9cd4-f09c29e29be0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_70bd16fa-d921-4f88-9cd4-f09c29e29be0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_70bd16fa-d921-4f88-9cd4-f09c29e29be0" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_70bd16fa-d921-4f88-9cd4-f09c29e29be0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_9e208d03-ac6a-42c1-a319-31a16cee09cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_70bd16fa-d921-4f88-9cd4-f09c29e29be0" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_9e208d03-ac6a-42c1-a319-31a16cee09cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_BMOLoanAndSecurityAgreementMember_c4205868-c3d6-45ae-92ed-e2c2b02395ef" xlink:href="byon-20250930.xsd#byon_BMOLoanAndSecurityAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_9e208d03-ac6a-42c1-a319-31a16cee09cd" xlink:to="loc_byon_BMOLoanAndSecurityAgreementMember_c4205868-c3d6-45ae-92ed-e2c2b02395ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_cb3b46a5-7970-4828-afb0-87cd5665dafe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_d5b61150-4acf-4f51-b266-fd990a56e0c4" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_cb3b46a5-7970-4828-afb0-87cd5665dafe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_cb3b46a5-7970-4828-afb0-87cd5665dafe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_cb3b46a5-7970-4828-afb0-87cd5665dafe" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_cb3b46a5-7970-4828-afb0-87cd5665dafe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_eed91403-f1af-4477-9062-2591d344f32b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_cb3b46a5-7970-4828-afb0-87cd5665dafe" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_eed91403-f1af-4477-9062-2591d344f32b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_88a4e998-1082-41c6-bd95-00a9ae050306" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_eed91403-f1af-4477-9062-2591d344f32b" xlink:to="loc_us-gaap_LineOfCreditMember_88a4e998-1082-41c6-bd95-00a9ae050306" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_91ef2639-c885-42b3-8b2c-8dad83fdb031" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_d5b61150-4acf-4f51-b266-fd990a56e0c4" xlink:to="loc_us-gaap_CreditFacilityAxis_91ef2639-c885-42b3-8b2c-8dad83fdb031" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_91ef2639-c885-42b3-8b2c-8dad83fdb031_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_91ef2639-c885-42b3-8b2c-8dad83fdb031" xlink:to="loc_us-gaap_CreditFacilityDomain_91ef2639-c885-42b3-8b2c-8dad83fdb031_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_e6b9526e-4fe4-48f1-a81d-6333f50cc16a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_91ef2639-c885-42b3-8b2c-8dad83fdb031" xlink:to="loc_us-gaap_CreditFacilityDomain_e6b9526e-4fe4-48f1-a81d-6333f50cc16a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_a70a5d1b-d977-4daf-b5d1-bd9f7f9161f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_e6b9526e-4fe4-48f1-a81d-6333f50cc16a" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_a70a5d1b-d977-4daf-b5d1-bd9f7f9161f2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_1e860413-9d5f-4f69-9118-e44e64eca300" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_931672cd-6818-4d24-8c38-d790edced4d2" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_1e860413-9d5f-4f69-9118-e44e64eca300" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_7faed172-e15a-48d3-bbe9-6edeaa5e6a0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_931672cd-6818-4d24-8c38-d790edced4d2" xlink:to="loc_us-gaap_DebtInstrumentTerm_7faed172-e15a-48d3-bbe9-6edeaa5e6a0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_DebtInstrumentInterestPeriod_e58043b6-bb9a-47bc-b34d-c39253298da3" xlink:href="byon-20250930.xsd#byon_DebtInstrumentInterestPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_931672cd-6818-4d24-8c38-d790edced4d2" xlink:to="loc_byon_DebtInstrumentInterestPeriod_e58043b6-bb9a-47bc-b34d-c39253298da3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_f11cf74d-a745-4168-82b6-eb248d66461f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_931672cd-6818-4d24-8c38-d790edced4d2" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_f11cf74d-a745-4168-82b6-eb248d66461f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_2aeae939-3869-4589-9d8e-40b82e2b972d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_931672cd-6818-4d24-8c38-d790edced4d2" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_2aeae939-3869-4589-9d8e-40b82e2b972d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_1968c50e-5133-4da2-919f-4cc169f66f4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_931672cd-6818-4d24-8c38-d790edced4d2" xlink:to="loc_us-gaap_LineOfCredit_1968c50e-5133-4da2-919f-4cc169f66f4b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_a1160f2a-8d86-4182-9847-dad71a6e6e27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_931672cd-6818-4d24-8c38-d790edced4d2" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_a1160f2a-8d86-4182-9847-dad71a6e6e27" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/LEASESNarrativeDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#LEASESNarrativeDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/LEASESNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_01ae3a27-7cf1-435f-bb2f-7bd0cae9f0dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_42816b23-9e12-4bcd-b4fb-df095c01dd33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_01ae3a27-7cf1-435f-bb2f-7bd0cae9f0dc" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_42816b23-9e12-4bcd-b4fb-df095c01dd33" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_880bd9bc-6d0d-4ca7-96af-5260bb64cdc6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_42816b23-9e12-4bcd-b4fb-df095c01dd33" xlink:to="loc_srt_RangeAxis_880bd9bc-6d0d-4ca7-96af-5260bb64cdc6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_880bd9bc-6d0d-4ca7-96af-5260bb64cdc6_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_880bd9bc-6d0d-4ca7-96af-5260bb64cdc6" xlink:to="loc_srt_RangeMember_880bd9bc-6d0d-4ca7-96af-5260bb64cdc6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f6f6d44c-5f78-411d-b03f-aaa947cc598d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_880bd9bc-6d0d-4ca7-96af-5260bb64cdc6" xlink:to="loc_srt_RangeMember_f6f6d44c-5f78-411d-b03f-aaa947cc598d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_3bd24a88-828b-4589-bae2-6c4a8ec65f2f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f6f6d44c-5f78-411d-b03f-aaa947cc598d" xlink:to="loc_srt_MinimumMember_3bd24a88-828b-4589-bae2-6c4a8ec65f2f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_e50c7c39-4dfb-4e7e-bf00-0127abc82c0a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f6f6d44c-5f78-411d-b03f-aaa947cc598d" xlink:to="loc_srt_MaximumMember_e50c7c39-4dfb-4e7e-bf00-0127abc82c0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseRemainingLeaseTerm_3ac3f32b-c038-4579-82d3-6a857b702e20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseRemainingLeaseTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_01ae3a27-7cf1-435f-bb2f-7bd0cae9f0dc" xlink:to="loc_us-gaap_LesseeOperatingLeaseRemainingLeaseTerm_3ac3f32b-c038-4579-82d3-6a857b702e20" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/COMMITMENTSANDCONTINGENCIESDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#COMMITMENTSANDCONTINGENCIESDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/COMMITMENTSANDCONTINGENCIESDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_44b3779b-0f0c-443f-b748-2b7f186eced4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_cc7e1237-e21a-4c5f-b242-06e1c1cf63e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_44b3779b-0f0c-443f-b748-2b7f186eced4" xlink:to="loc_us-gaap_OtherCommitmentsTable_cc7e1237-e21a-4c5f-b242-06e1c1cf63e4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_51319fa1-852c-41ca-b476-b877a4f0285d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_cc7e1237-e21a-4c5f-b242-06e1c1cf63e4" xlink:to="loc_us-gaap_DebtInstrumentAxis_51319fa1-852c-41ca-b476-b877a4f0285d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_51319fa1-852c-41ca-b476-b877a4f0285d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_51319fa1-852c-41ca-b476-b877a4f0285d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_51319fa1-852c-41ca-b476-b877a4f0285d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_99357dbf-2871-4143-b481-cb5dab26a929" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_51319fa1-852c-41ca-b476-b877a4f0285d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_99357dbf-2871-4143-b481-cb5dab26a929" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_DelayedDrawTermLoanCommitmentsMember_cae1827b-f4c7-4690-9ff4-e1cf3e98c6fb" xlink:href="byon-20250930.xsd#byon_DelayedDrawTermLoanCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_99357dbf-2871-4143-b481-cb5dab26a929" xlink:to="loc_byon_DelayedDrawTermLoanCommitmentsMember_cae1827b-f4c7-4690-9ff4-e1cf3e98c6fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_b6d61bb7-f13d-4821-833d-76d101f25aee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_cc7e1237-e21a-4c5f-b242-06e1c1cf63e4" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_b6d61bb7-f13d-4821-833d-76d101f25aee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_b6d61bb7-f13d-4821-833d-76d101f25aee_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_b6d61bb7-f13d-4821-833d-76d101f25aee" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_b6d61bb7-f13d-4821-833d-76d101f25aee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_74dc88d2-0a7c-482b-b807-48549b6371ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_b6d61bb7-f13d-4821-833d-76d101f25aee" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_74dc88d2-0a7c-482b-b807-48549b6371ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_acd41b8b-f799-4b11-a221-619a2c36a706" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_74dc88d2-0a7c-482b-b807-48549b6371ac" xlink:to="loc_us-gaap_LineOfCreditMember_acd41b8b-f799-4b11-a221-619a2c36a706" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_eb352e56-7be0-4673-a681-546a26210f19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_cc7e1237-e21a-4c5f-b242-06e1c1cf63e4" xlink:to="loc_us-gaap_OtherCommitmentsAxis_eb352e56-7be0-4673-a681-546a26210f19" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_eb352e56-7be0-4673-a681-546a26210f19_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_eb352e56-7be0-4673-a681-546a26210f19" xlink:to="loc_us-gaap_OtherCommitmentsDomain_eb352e56-7be0-4673-a681-546a26210f19_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_362b46cf-d3cd-4538-afd4-9063eb04221f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_eb352e56-7be0-4673-a681-546a26210f19" xlink:to="loc_us-gaap_OtherCommitmentsDomain_362b46cf-d3cd-4538-afd4-9063eb04221f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_f6e7edb0-c6da-4624-8600-64d8d77adb1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_44b3779b-0f0c-443f-b748-2b7f186eced4" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_f6e7edb0-c6da-4624-8600-64d8d77adb1e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_8cc3dfec-09bd-44e0-96af-b2e37c9bbd94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_44b3779b-0f0c-443f-b748-2b7f186eced4" xlink:to="loc_us-gaap_LineOfCredit_8cc3dfec-09bd-44e0-96af-b2e37c9bbd94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsFairValueDisclosure_d9942ef8-1043-474a-a2a8-d685a2e6404e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_44b3779b-0f0c-443f-b748-2b7f186eced4" xlink:to="loc_us-gaap_CommitmentsFairValueDisclosure_d9942ef8-1043-474a-a2a8-d685a2e6404e" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/STOCKHOLDERSEQUITYJonesTradingDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#STOCKHOLDERSEQUITYJonesTradingDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/STOCKHOLDERSEQUITYJonesTradingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_75b34862-98ea-4235-8c81-f0b64df5694d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_732cfd2f-db77-49fb-9a1e-4847781dfd05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_75b34862-98ea-4235-8c81-f0b64df5694d" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_732cfd2f-db77-49fb-9a1e-4847781dfd05" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_ebf15ff6-290b-427c-9d85-63937ccdaccd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_732cfd2f-db77-49fb-9a1e-4847781dfd05" xlink:to="loc_srt_CounterpartyNameAxis_ebf15ff6-290b-427c-9d85-63937ccdaccd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_ebf15ff6-290b-427c-9d85-63937ccdaccd_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_ebf15ff6-290b-427c-9d85-63937ccdaccd" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_ebf15ff6-290b-427c-9d85-63937ccdaccd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_5e4419ee-1d9d-423d-a179-02ab85a42efa" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_ebf15ff6-290b-427c-9d85-63937ccdaccd" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_5e4419ee-1d9d-423d-a179-02ab85a42efa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_JonesTradingInstitutionalServicesLLCMember_beba7315-79d8-4855-83f6-8484e7c40d3f" xlink:href="byon-20250930.xsd#byon_JonesTradingInstitutionalServicesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_5e4419ee-1d9d-423d-a179-02ab85a42efa" xlink:to="loc_byon_JonesTradingInstitutionalServicesLLCMember_beba7315-79d8-4855-83f6-8484e7c40d3f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_3b44e5c6-d8aa-4f88-ab32-38a13dad29dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_732cfd2f-db77-49fb-9a1e-4847781dfd05" xlink:to="loc_us-gaap_StatementClassOfStockAxis_3b44e5c6-d8aa-4f88-ab32-38a13dad29dd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_3b44e5c6-d8aa-4f88-ab32-38a13dad29dd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_3b44e5c6-d8aa-4f88-ab32-38a13dad29dd" xlink:to="loc_us-gaap_ClassOfStockDomain_3b44e5c6-d8aa-4f88-ab32-38a13dad29dd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_c6ed84d5-e5f4-408d-98d1-c7573c89e630" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_3b44e5c6-d8aa-4f88-ab32-38a13dad29dd" xlink:to="loc_us-gaap_ClassOfStockDomain_c6ed84d5-e5f4-408d-98d1-c7573c89e630" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_f892af25-80e9-47de-bad3-f04d9fd1e401" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_c6ed84d5-e5f4-408d-98d1-c7573c89e630" xlink:to="loc_us-gaap_CommonStockMember_f892af25-80e9-47de-bad3-f04d9fd1e401" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_aded16c0-a0f8-4524-83d0-c8f5223c1c43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_732cfd2f-db77-49fb-9a1e-4847781dfd05" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_aded16c0-a0f8-4524-83d0-c8f5223c1c43" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_aded16c0-a0f8-4524-83d0-c8f5223c1c43_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_aded16c0-a0f8-4524-83d0-c8f5223c1c43" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_aded16c0-a0f8-4524-83d0-c8f5223c1c43_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_df048b9c-1e40-4c36-b52b-cc5489a7cfcf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_aded16c0-a0f8-4524-83d0-c8f5223c1c43" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_df048b9c-1e40-4c36-b52b-cc5489a7cfcf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_AtTheMarketSalesProgramMember_7c404a9b-e840-4263-8779-03c50f70f0ef" xlink:href="byon-20250930.xsd#byon_AtTheMarketSalesProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_df048b9c-1e40-4c36-b52b-cc5489a7cfcf" xlink:to="loc_byon_AtTheMarketSalesProgramMember_7c404a9b-e840-4263-8779-03c50f70f0ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_70f6bb6e-b77d-487a-8564-c91df6594c88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_75b34862-98ea-4235-8c81-f0b64df5694d" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_70f6bb6e-b77d-487a-8564-c91df6594c88" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_9be507f4-a5e6-4ed5-948c-e2c26ab19f70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockConsiderationReceivedOnTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_75b34862-98ea-4235-8c81-f0b64df5694d" xlink:to="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_9be507f4-a5e6-4ed5-948c-e2c26ab19f70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfStockIssuanceCosts_666b9419-0a50-4af5-86a5-160f3f7a24fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfStockIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_75b34862-98ea-4235-8c81-f0b64df5694d" xlink:to="loc_us-gaap_PaymentsOfStockIssuanceCosts_666b9419-0a50-4af5-86a5-160f3f7a24fb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_SaleOfStockOutstandingAmountAvailable_74f42f50-adc9-4303-b969-25f980df7ab2" xlink:href="byon-20250930.xsd#byon_SaleOfStockOutstandingAmountAvailable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_75b34862-98ea-4235-8c81-f0b64df5694d" xlink:to="loc_byon_SaleOfStockOutstandingAmountAvailable_74f42f50-adc9-4303-b969-25f980df7ab2" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/STOCKHOLDERSEQUITYStockRepurchaseProgramDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#STOCKHOLDERSEQUITYStockRepurchaseProgramDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/STOCKHOLDERSEQUITYStockRepurchaseProgramDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_32e72552-fe87-4e20-9a47-fde1ca1765f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_e5dca0b5-2c49-4123-b762-09c8008142aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_32e72552-fe87-4e20-9a47-fde1ca1765f1" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_e5dca0b5-2c49-4123-b762-09c8008142aa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_293e5434-815e-482d-9259-ef710f939af1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_e5dca0b5-2c49-4123-b762-09c8008142aa" xlink:to="loc_us-gaap_StatementClassOfStockAxis_293e5434-815e-482d-9259-ef710f939af1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_293e5434-815e-482d-9259-ef710f939af1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_293e5434-815e-482d-9259-ef710f939af1" xlink:to="loc_us-gaap_ClassOfStockDomain_293e5434-815e-482d-9259-ef710f939af1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_c0dc89ed-f957-4f91-98e6-03221f62a3fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_293e5434-815e-482d-9259-ef710f939af1" xlink:to="loc_us-gaap_ClassOfStockDomain_c0dc89ed-f957-4f91-98e6-03221f62a3fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_b508b5ca-21c5-4707-a72b-117f0d267249" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_c0dc89ed-f957-4f91-98e6-03221f62a3fe" xlink:to="loc_us-gaap_CommonStockMember_b508b5ca-21c5-4707-a72b-117f0d267249" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_70ebad13-9880-4328-9fdc-0207722ebf4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_32e72552-fe87-4e20-9a47-fde1ca1765f1" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_70ebad13-9880-4328-9fdc-0207722ebf4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_8c4792a9-8ad6-4b22-a43f-a4a4958a4c0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_32e72552-fe87-4e20-9a47-fde1ca1765f1" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_8c4792a9-8ad6-4b22-a43f-a4a4958a4c0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_d3dd0bcb-c8b5-41fc-9550-c75f029fb81d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_32e72552-fe87-4e20-9a47-fde1ca1765f1" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_d3dd0bcb-c8b5-41fc-9550-c75f029fb81d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_91918aa9-2f54-430a-b3f0-633daf3b3a0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_32e72552-fe87-4e20-9a47-fde1ca1765f1" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_91918aa9-2f54-430a-b3f0-633daf3b3a0a" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/STOCKBASEDAWARDSStockbasedCompensationExpenseDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#STOCKBASEDAWARDSStockbasedCompensationExpenseDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/STOCKBASEDAWARDSStockbasedCompensationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_6df56579-2df4-4434-bfc9-2876d9015c9e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_87672681-f511-462b-b8fa-8be113fffc59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_6df56579-2df4-4434-bfc9-2876d9015c9e" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_87672681-f511-462b-b8fa-8be113fffc59" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_fdc27dfe-4ab6-41d2-a7fd-b8f639599387" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_87672681-f511-462b-b8fa-8be113fffc59" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_fdc27dfe-4ab6-41d2-a7fd-b8f639599387" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_fdc27dfe-4ab6-41d2-a7fd-b8f639599387_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_fdc27dfe-4ab6-41d2-a7fd-b8f639599387" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_fdc27dfe-4ab6-41d2-a7fd-b8f639599387_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_c86e51b0-f081-4572-a93a-26020f5f08a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_fdc27dfe-4ab6-41d2-a7fd-b8f639599387" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_c86e51b0-f081-4572-a93a-26020f5f08a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_9a4a5b63-7d06-4023-bd93-4efeeb8b5fff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c86e51b0-f081-4572-a93a-26020f5f08a4" xlink:to="loc_us-gaap_CostOfSalesMember_9a4a5b63-7d06-4023-bd93-4efeeb8b5fff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_SalesAndMarketingMember_1d0265d4-01f5-4eb2-8b2a-ac5a38cb4ac5" xlink:href="byon-20250930.xsd#byon_SalesAndMarketingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c86e51b0-f081-4572-a93a-26020f5f08a4" xlink:to="loc_byon_SalesAndMarketingMember_1d0265d4-01f5-4eb2-8b2a-ac5a38cb4ac5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_TechnologyMember_75c10e4c-5e2a-4366-817e-e6247c35e60c" xlink:href="byon-20250930.xsd#byon_TechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c86e51b0-f081-4572-a93a-26020f5f08a4" xlink:to="loc_byon_TechnologyMember_75c10e4c-5e2a-4366-817e-e6247c35e60c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_f21eabfa-4720-4b3b-b7d2-9212355bd3f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c86e51b0-f081-4572-a93a-26020f5f08a4" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_f21eabfa-4720-4b3b-b7d2-9212355bd3f7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_1a76ea94-20ff-4ec6-9f9e-fae74afd839d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_6df56579-2df4-4434-bfc9-2876d9015c9e" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_1a76ea94-20ff-4ec6-9f9e-fae74afd839d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/STOCKBASEDAWARDSNarrativeDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#STOCKBASEDAWARDSNarrativeDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/STOCKBASEDAWARDSNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1b5ce3f7-3a2e-4f82-a094-31335654dc62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5493092c-33c2-4d51-b06b-96a0bf83e92f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1b5ce3f7-3a2e-4f82-a094-31335654dc62" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5493092c-33c2-4d51-b06b-96a0bf83e92f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_25be1f3e-2762-415b-832b-db035b8f45d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5493092c-33c2-4d51-b06b-96a0bf83e92f" xlink:to="loc_us-gaap_AwardTypeAxis_25be1f3e-2762-415b-832b-db035b8f45d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_25be1f3e-2762-415b-832b-db035b8f45d1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_25be1f3e-2762-415b-832b-db035b8f45d1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_25be1f3e-2762-415b-832b-db035b8f45d1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7f1006c5-303a-459e-be95-94e668130728" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_25be1f3e-2762-415b-832b-db035b8f45d1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7f1006c5-303a-459e-be95-94e668130728" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_d1e72d14-08a2-4938-84ad-9148c8e9e82e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7f1006c5-303a-459e-be95-94e668130728" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_d1e72d14-08a2-4938-84ad-9148c8e9e82e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_8153e4f7-7c40-4d70-8caf-5a998c37c4af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7f1006c5-303a-459e-be95-94e668130728" xlink:to="loc_us-gaap_PerformanceSharesMember_8153e4f7-7c40-4d70-8caf-5a998c37c4af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_PerformanceShareOptionsMember_0463bab8-1f3d-44b4-a86d-d595816d67ec" xlink:href="byon-20250930.xsd#byon_PerformanceShareOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7f1006c5-303a-459e-be95-94e668130728" xlink:to="loc_byon_PerformanceShareOptionsMember_0463bab8-1f3d-44b4-a86d-d595816d67ec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_8aef9ae3-247e-47f4-a806-d89c92c2e173" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7f1006c5-303a-459e-be95-94e668130728" xlink:to="loc_us-gaap_EmployeeStockMember_8aef9ae3-247e-47f4-a806-d89c92c2e173" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_6670edf2-d7e4-410f-83e4-cd88e82c524e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5493092c-33c2-4d51-b06b-96a0bf83e92f" xlink:to="loc_us-gaap_VestingAxis_6670edf2-d7e4-410f-83e4-cd88e82c524e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_6670edf2-d7e4-410f-83e4-cd88e82c524e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_6670edf2-d7e4-410f-83e4-cd88e82c524e" xlink:to="loc_us-gaap_VestingDomain_6670edf2-d7e4-410f-83e4-cd88e82c524e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_f0723514-5994-4f56-91b3-23c688b8bd27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_6670edf2-d7e4-410f-83e4-cd88e82c524e" xlink:to="loc_us-gaap_VestingDomain_f0723514-5994-4f56-91b3-23c688b8bd27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_FirstYearMember_f94e57f1-a1df-4ba5-80e8-20fbf5b284ef" xlink:href="byon-20250930.xsd#byon_FirstYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_f0723514-5994-4f56-91b3-23c688b8bd27" xlink:to="loc_byon_FirstYearMember_f94e57f1-a1df-4ba5-80e8-20fbf5b284ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_SecondYearMember_7f5fc7cb-595c-466b-962b-ac37dfff3461" xlink:href="byon-20250930.xsd#byon_SecondYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_f0723514-5994-4f56-91b3-23c688b8bd27" xlink:to="loc_byon_SecondYearMember_7f5fc7cb-595c-466b-962b-ac37dfff3461" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_ThirdYearMember_62bb0dd5-4c3a-42fb-acf0-4b18da2abdb9" xlink:href="byon-20250930.xsd#byon_ThirdYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_f0723514-5994-4f56-91b3-23c688b8bd27" xlink:to="loc_byon_ThirdYearMember_62bb0dd5-4c3a-42fb-acf0-4b18da2abdb9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_4bc39189-c483-4334-975a-5514fe99f467" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5493092c-33c2-4d51-b06b-96a0bf83e92f" xlink:to="loc_us-gaap_PlanNameAxis_4bc39189-c483-4334-975a-5514fe99f467" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_4bc39189-c483-4334-975a-5514fe99f467_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_4bc39189-c483-4334-975a-5514fe99f467" xlink:to="loc_us-gaap_PlanNameDomain_4bc39189-c483-4334-975a-5514fe99f467_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_2cf0147f-7728-4e55-9620-97b751d72dc3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_4bc39189-c483-4334-975a-5514fe99f467" xlink:to="loc_us-gaap_PlanNameDomain_2cf0147f-7728-4e55-9620-97b751d72dc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_AmendedAndRestated2005EquityIncentivePlanMember_4a94719b-65b3-48db-a4f8-54a24246924e" xlink:href="byon-20250930.xsd#byon_AmendedAndRestated2005EquityIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_2cf0147f-7728-4e55-9620-97b751d72dc3" xlink:to="loc_byon_AmendedAndRestated2005EquityIncentivePlanMember_4a94719b-65b3-48db-a4f8-54a24246924e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_ada151f2-4142-4ae0-9d33-305aecb91513" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_5493092c-33c2-4d51-b06b-96a0bf83e92f" xlink:to="loc_srt_RangeAxis_ada151f2-4142-4ae0-9d33-305aecb91513" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ada151f2-4142-4ae0-9d33-305aecb91513_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_ada151f2-4142-4ae0-9d33-305aecb91513" xlink:to="loc_srt_RangeMember_ada151f2-4142-4ae0-9d33-305aecb91513_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_122eba27-6eca-4927-a895-c4cd30b3aa15" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_ada151f2-4142-4ae0-9d33-305aecb91513" xlink:to="loc_srt_RangeMember_122eba27-6eca-4927-a895-c4cd30b3aa15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_987fd03d-1569-4a49-9682-c7d9426ed7c8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_122eba27-6eca-4927-a895-c4cd30b3aa15" xlink:to="loc_srt_MinimumMember_987fd03d-1569-4a49-9682-c7d9426ed7c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_9fc6e68f-8fdc-46a7-888d-58591a41ef19" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_122eba27-6eca-4927-a895-c4cd30b3aa15" xlink:to="loc_srt_MaximumMember_9fc6e68f-8fdc-46a7-888d-58591a41ef19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_108db317-1dcd-4302-888c-6b6359863887" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1b5ce3f7-3a2e-4f82-a094-31335654dc62" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_108db317-1dcd-4302-888c-6b6359863887" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_405dbfd0-f228-4ce7-8360-0e0f90ff452c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1b5ce3f7-3a2e-4f82-a094-31335654dc62" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_405dbfd0-f228-4ce7-8360-0e0f90ff452c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_639e2abe-a08b-4713-ad78-899e09569493" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1b5ce3f7-3a2e-4f82-a094-31335654dc62" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_639e2abe-a08b-4713-ad78-899e09569493" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPerformanceMetrics_2a9c038e-3b2c-45d7-8ad1-12e8f45a843b" xlink:href="byon-20250930.xsd#byon_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPerformanceMetrics"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1b5ce3f7-3a2e-4f82-a094-31335654dc62" xlink:to="loc_byon_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPerformanceMetrics_2a9c038e-3b2c-45d7-8ad1-12e8f45a843b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceMetricsAdjustedEBITDAPerformanceMultiplier_7d9b831a-753e-4c33-a58a-a9304cdabbd6" xlink:href="byon-20250930.xsd#byon_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceMetricsAdjustedEBITDAPerformanceMultiplier"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1b5ce3f7-3a2e-4f82-a094-31335654dc62" xlink:to="loc_byon_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceMetricsAdjustedEBITDAPerformanceMultiplier_7d9b831a-753e-4c33-a58a-a9304cdabbd6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceMetricsGrossMarginPerformanceMultiplier_507d63e8-b7aa-46a6-9626-3b0408661567" xlink:href="byon-20250930.xsd#byon_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceMetricsGrossMarginPerformanceMultiplier"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1b5ce3f7-3a2e-4f82-a094-31335654dc62" xlink:to="loc_byon_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceMetricsGrossMarginPerformanceMultiplier_507d63e8-b7aa-46a6-9626-3b0408661567" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceMetricsContributionMarginPerformanceMultiplier_5baef4cc-2b5b-4fd3-afbc-584e52d890fa" xlink:href="byon-20250930.xsd#byon_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceMetricsContributionMarginPerformanceMultiplier"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1b5ce3f7-3a2e-4f82-a094-31335654dc62" xlink:to="loc_byon_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceMetricsContributionMarginPerformanceMultiplier_5baef4cc-2b5b-4fd3-afbc-584e52d890fa" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceMetricsMaximumPayoutPercentOfTargetPSUs_2a6f382c-da6f-4721-b3f4-9a2f8f25e546" xlink:href="byon-20250930.xsd#byon_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceMetricsMaximumPayoutPercentOfTargetPSUs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1b5ce3f7-3a2e-4f82-a094-31335654dc62" xlink:to="loc_byon_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceMetricsMaximumPayoutPercentOfTargetPSUs_2a6f382c-da6f-4721-b3f4-9a2f8f25e546" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeBenefitsAndShareBasedCompensation_10d2badf-7abf-4000-bec4-df74890c3db5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeBenefitsAndShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1b5ce3f7-3a2e-4f82-a094-31335654dc62" xlink:to="loc_us-gaap_EmployeeBenefitsAndShareBasedCompensation_10d2badf-7abf-4000-bec4-df74890c3db5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan_c234f5f5-317d-475a-80a4-d74c878bee99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1b5ce3f7-3a2e-4f82-a094-31335654dc62" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan_c234f5f5-317d-475a-80a4-d74c878bee99" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_StockIssuedDuringPeriodEmployeeStockOwnershipPlanAveragePricePerShare_ca2f633b-5f9b-40f5-a96a-96ee50c237f4" xlink:href="byon-20250930.xsd#byon_StockIssuedDuringPeriodEmployeeStockOwnershipPlanAveragePricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1b5ce3f7-3a2e-4f82-a094-31335654dc62" xlink:to="loc_byon_StockIssuedDuringPeriodEmployeeStockOwnershipPlanAveragePricePerShare_ca2f633b-5f9b-40f5-a96a-96ee50c237f4" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_4c94b62e-d46e-4051-9918-d9fb665f169c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_1b5ce3f7-3a2e-4f82-a094-31335654dc62" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_4c94b62e-d46e-4051-9918-d9fb665f169c" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/STOCKBASEDAWARDSRestrictedstockunitPSUandPerformanceShareOptionAwardActivityDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#STOCKBASEDAWARDSRestrictedstockunitPSUandPerformanceShareOptionAwardActivityDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/STOCKBASEDAWARDSRestrictedstockunitPSUandPerformanceShareOptionAwardActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ffdab063-ba20-4839-8b69-5cdcf5eb2f95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_06aab0a3-4aff-42b7-a7a8-2cadccf13694" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ffdab063-ba20-4839-8b69-5cdcf5eb2f95" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_06aab0a3-4aff-42b7-a7a8-2cadccf13694" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_90737173-672b-4285-9520-4322798b711c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_06aab0a3-4aff-42b7-a7a8-2cadccf13694" xlink:to="loc_us-gaap_AwardTypeAxis_90737173-672b-4285-9520-4322798b711c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_90737173-672b-4285-9520-4322798b711c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_90737173-672b-4285-9520-4322798b711c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_90737173-672b-4285-9520-4322798b711c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b03d3100-652d-442c-8df3-6c5c14d41ed6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_90737173-672b-4285-9520-4322798b711c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b03d3100-652d-442c-8df3-6c5c14d41ed6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_RestrictedStockPerformanceSharesAndPerformanceShareOptionsMember_2a9e6273-ef60-41a7-b9ad-5b2fb5eabf59" xlink:href="byon-20250930.xsd#byon_RestrictedStockPerformanceSharesAndPerformanceShareOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b03d3100-652d-442c-8df3-6c5c14d41ed6" xlink:to="loc_byon_RestrictedStockPerformanceSharesAndPerformanceShareOptionsMember_2a9e6273-ef60-41a7-b9ad-5b2fb5eabf59" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_89d45677-02ea-4d1a-8896-97fdf4763773" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ffdab063-ba20-4839-8b69-5cdcf5eb2f95" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_89d45677-02ea-4d1a-8896-97fdf4763773" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_e9ea2708-0272-4ebd-8fd0-37872ebd2ea6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_89d45677-02ea-4d1a-8896-97fdf4763773" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_e9ea2708-0272-4ebd-8fd0-37872ebd2ea6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_6c9fe208-b60b-46c1-a9cc-e8b7529480d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_89d45677-02ea-4d1a-8896-97fdf4763773" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_6c9fe208-b60b-46c1-a9cc-e8b7529480d1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_c9b33cdb-f243-4050-8270-7e5b8a4f9f2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_89d45677-02ea-4d1a-8896-97fdf4763773" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_c9b33cdb-f243-4050-8270-7e5b8a4f9f2e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_eb99fba5-184f-498c-92b4-925068773833" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_89d45677-02ea-4d1a-8896-97fdf4763773" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_eb99fba5-184f-498c-92b4-925068773833" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_94e929a4-6b03-498e-b70c-c6659f40c35b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_49e89d07-cab0-45bc-baa9-b3af15723d2d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ffdab063-ba20-4839-8b69-5cdcf5eb2f95" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_49e89d07-cab0-45bc-baa9-b3af15723d2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_f53bb497-b275-4a2a-8ed2-4cf4186d643d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_49e89d07-cab0-45bc-baa9-b3af15723d2d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_f53bb497-b275-4a2a-8ed2-4cf4186d643d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_80103fb0-c7e5-4df7-a589-6f97be724f90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_49e89d07-cab0-45bc-baa9-b3af15723d2d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_80103fb0-c7e5-4df7-a589-6f97be724f90" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_b49a60b5-c0e5-4d2d-abad-ba32e729d24d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_49e89d07-cab0-45bc-baa9-b3af15723d2d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_b49a60b5-c0e5-4d2d-abad-ba32e729d24d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_faf871d7-d838-4324-9503-3d7873b80eed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_49e89d07-cab0-45bc-baa9-b3af15723d2d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_faf871d7-d838-4324-9503-3d7873b80eed" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_dbb1e253-2bbb-47c0-b659-06ff3d005936" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/REVENUEANDCONTRACTLIABILITYNarrativeDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#REVENUEANDCONTRACTLIABILITYNarrativeDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/REVENUEANDCONTRACTLIABILITYNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_a29ce0b3-01f2-45bd-b3f6-3e90d82b4e08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_58d0ccea-f88e-46f7-a2eb-eb66d22ce02e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_a29ce0b3-01f2-45bd-b3f6-3e90d82b4e08" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_58d0ccea-f88e-46f7-a2eb-eb66d22ce02e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_ContractWithCustomerLiabilityAxis_84481746-6fd4-4da0-b074-7afef6d4a997" xlink:href="byon-20250930.xsd#byon_ContractWithCustomerLiabilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_58d0ccea-f88e-46f7-a2eb-eb66d22ce02e" xlink:to="loc_byon_ContractWithCustomerLiabilityAxis_84481746-6fd4-4da0-b074-7afef6d4a997" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_ContractWithCustomerLiabilityDomain_84481746-6fd4-4da0-b074-7afef6d4a997_default" xlink:href="byon-20250930.xsd#byon_ContractWithCustomerLiabilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_byon_ContractWithCustomerLiabilityAxis_84481746-6fd4-4da0-b074-7afef6d4a997" xlink:to="loc_byon_ContractWithCustomerLiabilityDomain_84481746-6fd4-4da0-b074-7afef6d4a997_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_ContractWithCustomerLiabilityDomain_af4cb41c-b6cd-4dd9-b9c4-5d50d8d052fe" xlink:href="byon-20250930.xsd#byon_ContractWithCustomerLiabilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_byon_ContractWithCustomerLiabilityAxis_84481746-6fd4-4da0-b074-7afef6d4a997" xlink:to="loc_byon_ContractWithCustomerLiabilityDomain_af4cb41c-b6cd-4dd9-b9c4-5d50d8d052fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_ClubORewardPointsMember_0e1c1597-7585-47f6-a780-49dd35e85dc8" xlink:href="byon-20250930.xsd#byon_ClubORewardPointsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_byon_ContractWithCustomerLiabilityDomain_af4cb41c-b6cd-4dd9-b9c4-5d50d8d052fe" xlink:to="loc_byon_ClubORewardPointsMember_0e1c1597-7585-47f6-a780-49dd35e85dc8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredRevenueCurrent_69c8be4a-b29b-42ef-8781-9d64d06263c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredRevenueCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_a29ce0b3-01f2-45bd-b3f6-3e90d82b4e08" xlink:to="loc_us-gaap_DeferredRevenueCurrent_69c8be4a-b29b-42ef-8781-9d64d06263c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_GiftCardAndClubORewardsBreakage_e90b59bd-184c-430f-9f1c-0209b0526a36" xlink:href="byon-20250930.xsd#byon_GiftCardAndClubORewardsBreakage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_a29ce0b3-01f2-45bd-b3f6-3e90d82b4e08" xlink:to="loc_byon_GiftCardAndClubORewardsBreakage_e90b59bd-184c-430f-9f1c-0209b0526a36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_b5ed0158-0cdc-4aa0-817b-c18774c97fd9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_a29ce0b3-01f2-45bd-b3f6-3e90d82b4e08" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_b5ed0158-0cdc-4aa0-817b-c18774c97fd9" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/NETLOSSPERSHAREAntidilutiveSecuritiesDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#NETLOSSPERSHAREAntidilutiveSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/NETLOSSPERSHAREAntidilutiveSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_ad3fa649-5e4c-46b8-a3fb-06af3964613a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_7af05810-e9cf-4ed6-a9a4-f5c9064107fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_ad3fa649-5e4c-46b8-a3fb-06af3964613a" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_7af05810-e9cf-4ed6-a9a4-f5c9064107fe" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_d768eaea-2dea-47a4-8946-c47e37aa5d77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_7af05810-e9cf-4ed6-a9a4-f5c9064107fe" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_d768eaea-2dea-47a4-8946-c47e37aa5d77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_d768eaea-2dea-47a4-8946-c47e37aa5d77_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_d768eaea-2dea-47a4-8946-c47e37aa5d77" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_d768eaea-2dea-47a4-8946-c47e37aa5d77_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_fa80cb59-749f-4a6f-9ab4-153346fbd0f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_d768eaea-2dea-47a4-8946-c47e37aa5d77" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_fa80cb59-749f-4a6f-9ab4-153346fbd0f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_RestrictedStockPerformanceSharesAndPerformanceShareOptionsMember_c9b0af6d-9242-47ac-9361-86740ce8c599" xlink:href="byon-20250930.xsd#byon_RestrictedStockPerformanceSharesAndPerformanceShareOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_fa80cb59-749f-4a6f-9ab4-153346fbd0f9" xlink:to="loc_byon_RestrictedStockPerformanceSharesAndPerformanceShareOptionsMember_c9b0af6d-9242-47ac-9361-86740ce8c599" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_e79a9ca5-9363-461c-aff1-1df521c55192" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_fa80cb59-749f-4a6f-9ab4-153346fbd0f9" xlink:to="loc_us-gaap_EmployeeStockMember_e79a9ca5-9363-461c-aff1-1df521c55192" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_3287c7af-f799-4d01-a135-7c6ad70a2944" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_ad3fa649-5e4c-46b8-a3fb-06af3964613a" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_3287c7af-f799-4d01-a135-7c6ad70a2944" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://beyond.com/role/SUBSEQUENTEVENTSDetails" xlink:type="simple" xlink:href="byon-20250930.xsd#SUBSEQUENTEVENTSDetails"/>
  <link:definitionLink xlink:role="http://beyond.com/role/SUBSEQUENTEVENTSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_43c8fd8d-fd70-4036-9407-77fafcbd6d88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_f948197d-d285-43c0-9b7d-7d2c7b718575" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_43c8fd8d-fd70-4036-9407-77fafcbd6d88" xlink:to="loc_us-gaap_SubsequentEventTable_f948197d-d285-43c0-9b7d-7d2c7b718575" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_4ed71e3b-72d4-43f5-bc9d-1a8b56e9b3ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_f948197d-d285-43c0-9b7d-7d2c7b718575" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_4ed71e3b-72d4-43f5-bc9d-1a8b56e9b3ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_4ed71e3b-72d4-43f5-bc9d-1a8b56e9b3ae_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_4ed71e3b-72d4-43f5-bc9d-1a8b56e9b3ae" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_4ed71e3b-72d4-43f5-bc9d-1a8b56e9b3ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_c62e4cd5-e2e6-46ed-8f8c-c3a24dbcbc64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_4ed71e3b-72d4-43f5-bc9d-1a8b56e9b3ae" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_c62e4cd5-e2e6-46ed-8f8c-c3a24dbcbc64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_5f7dafbe-f32f-4c06-9df1-e1264ea0c00b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_c62e4cd5-e2e6-46ed-8f8c-c3a24dbcbc64" xlink:to="loc_us-gaap_SubsequentEventMember_5f7dafbe-f32f-4c06-9df1-e1264ea0c00b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_37c2e8c9-2bd8-474f-970e-b874fa6d9c03" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_43c8fd8d-fd70-4036-9407-77fafcbd6d88" xlink:to="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_37c2e8c9-2bd8-474f-970e-b874fa6d9c03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_1b195aaf-ec8f-4ca1-a5dd-168aaa22f8a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_43c8fd8d-fd70-4036-9407-77fafcbd6d88" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_1b195aaf-ec8f-4ca1-a5dd-168aaa22f8a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_ClassOfWarrantOrRightEarlyExpirationPriceCommonStockPriceThreshold_976aa337-ef8d-4fac-a56e-a054625cdcac" xlink:href="byon-20250930.xsd#byon_ClassOfWarrantOrRightEarlyExpirationPriceCommonStockPriceThreshold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_43c8fd8d-fd70-4036-9407-77fafcbd6d88" xlink:to="loc_byon_ClassOfWarrantOrRightEarlyExpirationPriceCommonStockPriceThreshold_976aa337-ef8d-4fac-a56e-a054625cdcac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_byon_ClassOfWarrantOrRightEarlyExpirationPriceThresholdTradingDays_c4b30799-62d7-43a9-a96c-33e5404024c7" xlink:href="byon-20250930.xsd#byon_ClassOfWarrantOrRightEarlyExpirationPriceThresholdTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_43c8fd8d-fd70-4036-9407-77fafcbd6d88" xlink:to="loc_byon_ClassOfWarrantOrRightEarlyExpirationPriceThresholdTradingDays_c4b30799-62d7-43a9-a96c-33e5404024c7" xlink:type="arc" order="3"/>
  </link:definitionLink>
</link:linkbase>
