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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e1d87-c59d-7ec5-9d4a-0e0dfc121940,g:0961ef02-7da2-49f9-8b4e-e7d3dbe26b3d-->
<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://www.sbgi.net/role/Cover" xlink:type="simple" xlink:href="sbgi-20260625.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019e1d89-15c2-7690-9244-98b94b1c899d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019e1d89-15c2-774a-81d7-d496871afb75" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_019e1d89-15c2-7690-9244-98b94b1c899d" xlink:to="loc_dei_DocumentInformationTable_019e1d89-15c2-774a-81d7-d496871afb75" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c2-7547-b6f4-cd8a74f9f1b6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019e1d89-15c2-774a-81d7-d496871afb75" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c2-7547-b6f4-cd8a74f9f1b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c2-7547-b6f4-cd8a74f9f1b6_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c2-7547-b6f4-cd8a74f9f1b6" xlink:to="loc_dei_EntityDomain_019e1d89-15c2-7547-b6f4-cd8a74f9f1b6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c2-72fd-8331-676da54246b4" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c2-7547-b6f4-cd8a74f9f1b6" xlink:to="loc_dei_EntityDomain_019e1d89-15c2-72fd-8331-676da54246b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c2-79d1-9f2b-e72132dd395e" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c2-72fd-8331-676da54246b4" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c2-79d1-9f2b-e72132dd395e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019e1d89-15c2-7d78-9f41-9718ab2d576e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e1d89-15c2-7690-9244-98b94b1c899d" xlink:to="loc_dei_DocumentType_019e1d89-15c2-7d78-9f41-9718ab2d576e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019e1d89-15c2-7da9-a04c-9dfa62f67105" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e1d89-15c2-7690-9244-98b94b1c899d" xlink:to="loc_dei_EntityRegistrantName_019e1d89-15c2-7da9-a04c-9dfa62f67105" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019e1d89-15c2-7ad2-aa65-a1674b69ad63" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e1d89-15c2-7690-9244-98b94b1c899d" xlink:to="loc_dei_EntityCentralIndexKey_019e1d89-15c2-7ad2-aa65-a1674b69ad63" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019e1d89-15c2-7492-a9e1-32252ebcbd5c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e1d89-15c2-7690-9244-98b94b1c899d" xlink:to="loc_dei_AmendmentFlag_019e1d89-15c2-7492-a9e1-32252ebcbd5c" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/STATEMENTSOFNETASSETSAVAILABLEFORBENEFITS" xlink:type="simple" xlink:href="sbgi-20260625.xsd#STATEMENTSOFNETASSETSAVAILABLEFORBENEFITS"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/STATEMENTSOFNETASSETSAVAILABLEFORBENEFITS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019e1d89-15c2-7ea1-87f3-4756513524ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable_019e1d89-15c2-7026-a42d-4658c03088c8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019e1d89-15c2-7ea1-87f3-4756513524ca" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable_019e1d89-15c2-7026-a42d-4658c03088c8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c2-7ce6-8be6-c72f62187530" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable_019e1d89-15c2-7026-a42d-4658c03088c8" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c2-7ce6-8be6-c72f62187530" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c2-7ce6-8be6-c72f62187530_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c2-7ce6-8be6-c72f62187530" xlink:to="loc_dei_EntityDomain_019e1d89-15c2-7ce6-8be6-c72f62187530_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c2-7f05-b939-dc76948e0cd1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c2-7ce6-8be6-c72f62187530" xlink:to="loc_dei_EntityDomain_019e1d89-15c2-7f05-b939-dc76948e0cd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c2-74b7-8ccf-97414df35bd4" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c2-7f05-b939-dc76948e0cd1" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c2-74b7-8ccf-97414df35bd4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetAbstract_019e1da9-2855-7e86-8d17-267d3e8c057d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019e1d89-15c2-7ea1-87f3-4756513524ca" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetAbstract_019e1da9-2855-7e86-8d17-267d3e8c057d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_019e1d9b-4cf6-7fdf-b5b3-ca439275e51c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAssetAbstract_019e1da9-2855-7e86-8d17-267d3e8c057d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_019e1d9b-4cf6-7fdf-b5b3-ca439275e51c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustContractValue_019e1d9b-4cf6-7ffb-bc58-401c668ed7b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustContractValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAssetAbstract_019e1da9-2855-7e86-8d17-267d3e8c057d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustContractValue_019e1d9b-4cf6-7ffb-bc58-401c668ed7b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairAndContractValue_019e1d9d-193f-7cf0-bade-33951eace2ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairAndContractValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAssetAbstract_019e1da9-2855-7e86-8d17-267d3e8c057d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairAndContractValue_019e1d9d-193f-7cf0-bade-33951eace2ec" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract_019e1daa-0976-7a80-ad7d-6fb3b0f15d10" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAssetAbstract_019e1da9-2855-7e86-8d17-267d3e8c057d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract_019e1daa-0976-7a80-ad7d-6fb3b0f15d10" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionReceivable_019e1da4-3120-750d-8d7b-2240b4fcb04d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantContributionReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract_019e1daa-0976-7a80-ad7d-6fb3b0f15d10" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionReceivable_019e1da4-3120-750d-8d7b-2240b4fcb04d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable_019e1d9d-c023-7e88-a913-87956c89acea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract_019e1daa-0976-7a80-ad7d-6fb3b0f15d10" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable_019e1d9d-c023-7e88-a913-87956c89acea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipant_019e1d9e-0e26-7c90-86c6-63e95b4097d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract_019e1daa-0976-7a80-ad7d-6fb3b0f15d10" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipant_019e1d9e-0e26-7c90-86c6-63e95b4097d1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReceivable_019e1da4-c337-7011-997c-53bd5b06887a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract_019e1daa-0976-7a80-ad7d-6fb3b0f15d10" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanReceivable_019e1da4-c337-7011-997c-53bd5b06887a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAsset_019e1da4-f40b-7145-91d4-bbaaf4f2f829" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAssetAbstract_019e1da9-2855-7e86-8d17-267d3e8c057d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAsset_019e1da4-f40b-7145-91d4-bbaaf4f2f829" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanLiabilityAbstract_019e1daa-c711-7727-9269-80c0d03f3d22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanLiabilityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019e1d89-15c2-7ea1-87f3-4756513524ca" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanLiabilityAbstract_019e1daa-c711-7727-9269-80c0d03f3d22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanExcessContributionPayable_019e1da6-23b3-7fbd-861a-e76ecaec7ea1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanExcessContributionPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanLiabilityAbstract_019e1daa-c711-7727-9269-80c0d03f3d22" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanExcessContributionPayable_019e1da6-23b3-7fbd-861a-e76ecaec7ea1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019e1da6-669c-7acb-b25e-5775f2ee408f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019e1d89-15c2-7ea1-87f3-4756513524ca" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019e1da6-669c-7acb-b25e-5775f2ee408f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/STATEMENTOFCHANGESINNETASSETSAVAILABLEFORBENEFITS" xlink:type="simple" xlink:href="sbgi-20260625.xsd#STATEMENTOFCHANGESINNETASSETSAVAILABLEFORBENEFITS"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/STATEMENTOFCHANGESINNETASSETSAVAILABLEFORBENEFITS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019e1d89-15c3-7b87-96e8-7616e1948649" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable_019e1d89-15c2-79e4-ae2e-a6ebae4409cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019e1d89-15c3-7b87-96e8-7616e1948649" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable_019e1d89-15c2-79e4-ae2e-a6ebae4409cb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c2-7987-b9ad-5b41135d3980" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable_019e1d89-15c2-79e4-ae2e-a6ebae4409cb" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c2-7987-b9ad-5b41135d3980" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c2-7987-b9ad-5b41135d3980_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c2-7987-b9ad-5b41135d3980" xlink:to="loc_dei_EntityDomain_019e1d89-15c2-7987-b9ad-5b41135d3980_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7242-bc0d-d5a30973783c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c2-7987-b9ad-5b41135d3980" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7242-bc0d-d5a30973783c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-7c8c-a565-96a088c42b50" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-7242-bc0d-d5a30973783c" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-7c8c-a565-96a088c42b50" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseAbstract_019e74ad-1102-7b79-8121-183bee9d7386" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019e1d89-15c3-7b87-96e8-7616e1948649" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseAbstract_019e74ad-1102-7b79-8121-183bee9d7386" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestmentAbstract_019e74b4-b538-7770-a75a-ee28ab65bb67" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestmentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseAbstract_019e74ad-1102-7b79-8121-183bee9d7386" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestmentAbstract_019e74b4-b538-7770-a75a-ee28ab65bb67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment_019e1db3-abe8-7bcf-b221-99261161ef52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestmentAbstract_019e74b4-b538-7770-a75a-ee28ab65bb67" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment_019e1db3-abe8-7bcf-b221-99261161ef52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestAndDividendIncomeOnInvestment_019e1db3-abe8-74ae-8926-1336b0d05c9c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestAndDividendIncomeOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestmentAbstract_019e74b4-b538-7770-a75a-ee28ab65bb67" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestAndDividendIncomeOnInvestment_019e1db3-abe8-74ae-8926-1336b0d05c9c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnNoteReceivableFromParticipant_019e1db9-bf0f-7e7c-9c32-d33d8638fb36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnNoteReceivableFromParticipant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestmentAbstract_019e74b4-b538-7770-a75a-ee28ab65bb67" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnNoteReceivableFromParticipant_019e1db9-bf0f-7e7c-9c32-d33d8638fb36" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPChangeInNetAssetAvailableForBenefitIncreaseDecreaseFromIncomeLossOnInvestmentAndIncreaseFromInterestIncomeOnNoteReceivableFromParticipant_019e1dc8-9e1e-71cc-ab19-7e8eb84c0329" xlink:href="sbgi-20260625.xsd#sbgi_EBPChangeInNetAssetAvailableForBenefitIncreaseDecreaseFromIncomeLossOnInvestmentAndIncreaseFromInterestIncomeOnNoteReceivableFromParticipant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestmentAbstract_019e74b4-b538-7770-a75a-ee28ab65bb67" xlink:to="loc_sbgi_EBPChangeInNetAssetAvailableForBenefitIncreaseDecreaseFromIncomeLossOnInvestmentAndIncreaseFromInterestIncomeOnNoteReceivableFromParticipant_019e1dc8-9e1e-71cc-ab19-7e8eb84c0329" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract_019e74ad-f0af-766c-a015-b2bd64f35eaf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseAbstract_019e74ad-1102-7b79-8121-183bee9d7386" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract_019e74ad-f0af-766c-a015-b2bd64f35eaf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionExcludingRollover_019e1dbb-3a18-7340-8849-dca32d537401" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionExcludingRollover"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract_019e74ad-f0af-766c-a015-b2bd64f35eaf" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionExcludingRollover_019e1dbb-3a18-7340-8849-dca32d537401" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash_019e1dbb-9e41-76b6-b1c9-ff538b67da70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract_019e74ad-f0af-766c-a015-b2bd64f35eaf" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash_019e1dbb-9e41-76b6-b1c9-ff538b67da70" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionRollover_019e1dbb-c17d-7e4f-a781-c7691e0ca867" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionRollover"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract_019e74ad-f0af-766c-a015-b2bd64f35eaf" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionRollover_019e1dbb-c17d-7e4f-a781-c7691e0ca867" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution_019e1dbb-fa43-7e53-bdbd-e44175ba4afa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract_019e74ad-f0af-766c-a015-b2bd64f35eaf" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution_019e1dbb-fa43-7e53-bdbd-e44175ba4afa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseAbstract_019e74af-0262-7d04-92cf-c37df6862c21" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019e1d89-15c3-7b87-96e8-7616e1948649" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseAbstract_019e74af-0262-7d04-92cf-c37df6862c21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant_019e74a7-5996-766c-9f6c-a968f47868bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseAbstract_019e74af-0262-7d04-92cf-c37df6862c21" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant_019e74a7-5996-766c-9f6c-a968f47868bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForAdministrativeExpense_019e1dc0-d9f4-71ac-85ea-a92b4b82968e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseAbstract_019e74af-0262-7d04-92cf-c37df6862c21" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForAdministrativeExpense_019e1dc0-d9f4-71ac-85ea-a92b4b82968e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPChangeInNetAssetAvailableForBenefitDecreaseFromDistributionOfParticipantLoans_019e74ab-3332-7497-a777-52ff34bba835" xlink:href="sbgi-20260625.xsd#sbgi_EBPChangeInNetAssetAvailableForBenefitDecreaseFromDistributionOfParticipantLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseAbstract_019e74af-0262-7d04-92cf-c37df6862c21" xlink:to="loc_sbgi_EBPChangeInNetAssetAvailableForBenefitDecreaseFromDistributionOfParticipantLoans_019e74ab-3332-7497-a777-52ff34bba835" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecrease_019e1dc0-891e-736f-9778-b37f4b9817c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseAbstract_019e74af-0262-7d04-92cf-c37df6862c21" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecrease_019e1dc0-891e-736f-9778-b37f4b9817c6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease_019e1dc0-12dd-7183-9e10-6c56246076a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019e1d89-15c3-7b87-96e8-7616e1948649" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease_019e1dc0-12dd-7183-9e10-6c56246076a7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019e1dbd-c3a7-7607-8331-31781eddc755" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019e1d89-15c3-7b87-96e8-7616e1948649" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019e1dbd-c3a7-7607-8331-31781eddc755" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019e1dcb-465d-7f3e-adb2-4bf2def98cb8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/PLANDESCRIPTION" xlink:type="simple" xlink:href="sbgi-20260625.xsd#PLANDESCRIPTION"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/PLANDESCRIPTION" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-7c01-a9eb-28142de4f99b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e1d89-15c3-77aa-a017-1051014ada18" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-7c01-a9eb-28142de4f99b" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e1d89-15c3-77aa-a017-1051014ada18" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-7e17-a8dc-a5d8fabfb6bb" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e1d89-15c3-77aa-a017-1051014ada18" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-7e17-a8dc-a5d8fabfb6bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7e17-a8dc-a5d8fabfb6bb_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7e17-a8dc-a5d8fabfb6bb" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7e17-a8dc-a5d8fabfb6bb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7234-83ac-eccd7a9d1b98" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7e17-a8dc-a5d8fabfb6bb" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7234-83ac-eccd7a9d1b98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-7486-9713-0c8e2ce8612e" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-7234-83ac-eccd7a9d1b98" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-7486-9713-0c8e2ce8612e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTextBlock_019e1d89-15c3-7014-aeba-a3e5f797528d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-7c01-a9eb-28142de4f99b" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTextBlock_019e1d89-15c3-7014-aeba-a3e5f797528d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES" xlink:type="simple" xlink:href="sbgi-20260625.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e1d89-15c3-7f41-b861-499ede186877" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e1d89-15c3-7dbc-881f-1487ef4119d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e1d89-15c3-7f41-b861-499ede186877" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e1d89-15c3-7dbc-881f-1487ef4119d4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-792a-8371-274fb6530305" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e1d89-15c3-7dbc-881f-1487ef4119d4" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-792a-8371-274fb6530305" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-792a-8371-274fb6530305_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-792a-8371-274fb6530305" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-792a-8371-274fb6530305_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7feb-b2a7-db641bfe9f4b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-792a-8371-274fb6530305" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7feb-b2a7-db641bfe9f4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-7f6b-b0fe-b9f5c5e2595b" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-7feb-b2a7-db641bfe9f4b" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-7f6b-b0fe-b9f5c5e2595b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanSummaryOfAccountingPolicyTextBlock_019e1d89-15c3-7354-b18a-7a39d705ccd6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanSummaryOfAccountingPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e1d89-15c3-7f41-b861-499ede186877" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanSummaryOfAccountingPolicyTextBlock_019e1d89-15c3-7354-b18a-7a39d705ccd6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/FAIRVALUEMEASUREMENTS" xlink:type="simple" xlink:href="sbgi-20260625.xsd#FAIRVALUEMEASUREMENTS"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/FAIRVALUEMEASUREMENTS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e1d89-15c3-710b-a86f-f02cd3192a47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e1d89-15c3-7391-a995-4c2744c0086c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e1d89-15c3-710b-a86f-f02cd3192a47" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e1d89-15c3-7391-a995-4c2744c0086c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-7a5f-821f-25b063d0a343" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e1d89-15c3-7391-a995-4c2744c0086c" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-7a5f-821f-25b063d0a343" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7a5f-821f-25b063d0a343_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7a5f-821f-25b063d0a343" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7a5f-821f-25b063d0a343_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7131-ab5c-9ca9475d15c7" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7a5f-821f-25b063d0a343" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7131-ab5c-9ca9475d15c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-7799-b3eb-e83ee12162d3" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-7131-ab5c-9ca9475d15c7" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-7799-b3eb-e83ee12162d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTextBlock_019e1d89-15c3-706e-8be3-4f99890dbee1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e1d89-15c3-710b-a86f-f02cd3192a47" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTextBlock_019e1d89-15c3-706e-8be3-4f99890dbee1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/INCOMETAXSTATUS" xlink:type="simple" xlink:href="sbgi-20260625.xsd#INCOMETAXSTATUS"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/INCOMETAXSTATUS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems_019e1d89-15c3-7697-a235-00fbef54dedf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable_019e1d89-15c3-768b-bc6b-3a102ecdcb0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems_019e1d89-15c3-7697-a235-00fbef54dedf" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable_019e1d89-15c3-768b-bc6b-3a102ecdcb0f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-71e5-a6cc-0feea207a870" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable_019e1d89-15c3-768b-bc6b-3a102ecdcb0f" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-71e5-a6cc-0feea207a870" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-71e5-a6cc-0feea207a870_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-71e5-a6cc-0feea207a870" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-71e5-a6cc-0feea207a870_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7ad5-a0e1-1d03333bf186" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-71e5-a6cc-0feea207a870" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7ad5-a0e1-1d03333bf186" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-79af-8c2c-099a237e206e" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-7ad5-a0e1-1d03333bf186" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-79af-8c2c-099a237e206e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTextBlock_019e1d89-15c3-78d9-aedf-764f6b652799" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanTaxStatusTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems_019e1d89-15c3-7697-a235-00fbef54dedf" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTextBlock_019e1d89-15c3-78d9-aedf-764f6b652799" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/FULLYBENEFITRESPONSIVEGUARANTEEDINVESTMENTCONTRACT" xlink:type="simple" xlink:href="sbgi-20260625.xsd#FULLYBENEFITRESPONSIVEGUARANTEEDINVESTMENTCONTRACT"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/FULLYBENEFITRESPONSIVEGUARANTEEDINVESTMENTCONTRACT" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractLineItems_019e27cc-a037-7816-99a9-50520f61d004" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTable_019e27cc-a037-7051-95c5-1b143c9a061a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractLineItems_019e27cc-a037-7816-99a9-50520f61d004" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTable_019e27cc-a037-7051-95c5-1b143c9a061a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e27cc-a037-73ff-8c5d-9a59c42392da" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTable_019e27cc-a037-7051-95c5-1b143c9a061a" xlink:to="loc_dei_LegalEntityAxis_019e27cc-a037-73ff-8c5d-9a59c42392da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e27cc-a037-73ff-8c5d-9a59c42392da_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e27cc-a037-73ff-8c5d-9a59c42392da" xlink:to="loc_dei_EntityDomain_019e27cc-a037-73ff-8c5d-9a59c42392da_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e27cc-a037-782f-aaf3-46d10fecf3da" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e27cc-a037-73ff-8c5d-9a59c42392da" xlink:to="loc_dei_EntityDomain_019e27cc-a037-782f-aaf3-46d10fecf3da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e27cc-f753-73e5-8842-02ae803595f3" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e27cc-a037-782f-aaf3-46d10fecf3da" xlink:to="loc_sbgi_EBP001Member_019e27cc-f753-73e5-8842-02ae803595f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTextBlock_019e27cc-a037-7d16-b4fb-760a4e5e2bdb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractLineItems_019e27cc-a037-7816-99a9-50520f61d004" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanFullyBenefitResponsiveInvestmentContractTextBlock_019e27cc-a037-7d16-b4fb-760a4e5e2bdb" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/RISKSANDUNCERTAINTIES" xlink:type="simple" xlink:href="sbgi-20260625.xsd#RISKSANDUNCERTAINTIES"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/RISKSANDUNCERTAINTIES" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpRiskAndUncertaintyLineItems_019e1d89-15c3-7e63-8226-18307faa9ad7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EbpRiskAndUncertaintyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpRiskAndUncertaintyTable_019e1d89-15c3-723a-9c48-92fd500aeb16" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EbpRiskAndUncertaintyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EbpRiskAndUncertaintyLineItems_019e1d89-15c3-7e63-8226-18307faa9ad7" xlink:to="loc_us-gaap-ebp_EbpRiskAndUncertaintyTable_019e1d89-15c3-723a-9c48-92fd500aeb16" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-72c6-acd5-3b9f4ba35caf" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EbpRiskAndUncertaintyTable_019e1d89-15c3-723a-9c48-92fd500aeb16" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-72c6-acd5-3b9f4ba35caf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-72c6-acd5-3b9f4ba35caf_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-72c6-acd5-3b9f4ba35caf" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-72c6-acd5-3b9f4ba35caf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7e6c-b3f2-3f2a3b86a5d2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-72c6-acd5-3b9f4ba35caf" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7e6c-b3f2-3f2a3b86a5d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-789b-8a4d-1317e80a2c8c" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-7e6c-b3f2-3f2a3b86a5d2" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-789b-8a4d-1317e80a2c8c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRiskAndUncertaintyTextBlock_019e1d89-15c3-709c-8838-45e2dbde4820" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRiskAndUncertaintyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EbpRiskAndUncertaintyLineItems_019e1d89-15c3-7e63-8226-18307faa9ad7" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanRiskAndUncertaintyTextBlock_019e1d89-15c3-709c-8838-45e2dbde4820" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500" xlink:type="simple" xlink:href="sbgi-20260625.xsd#DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-77da-b878-275952bf5988" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e1d89-15c3-7174-b92a-99889acc82a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-77da-b878-275952bf5988" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e1d89-15c3-7174-b92a-99889acc82a7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-7ca8-9735-a282097a5be6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e1d89-15c3-7174-b92a-99889acc82a7" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-7ca8-9735-a282097a5be6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7ca8-9735-a282097a5be6_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7ca8-9735-a282097a5be6" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7ca8-9735-a282097a5be6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7dc7-9ac3-ada708772fbc" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7ca8-9735-a282097a5be6" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7dc7-9ac3-ada708772fbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-74ef-9449-087e0651b4d0" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-7dc7-9ac3-ada708772fbc" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-74ef-9449-087e0651b4d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500TextBlock_019e1d89-15c3-772b-893e-7fad3f319279" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500TextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-77da-b878-275952bf5988" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500TextBlock_019e1d89-15c3-772b-893e-7fad3f319279" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/RELATEDPARTYANDPARTIESININTERESTTRANSACTIONS" xlink:type="simple" xlink:href="sbgi-20260625.xsd#RELATEDPARTYANDPARTIESININTERESTTRANSACTIONS"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/RELATEDPARTYANDPARTIESININTERESTTRANSACTIONS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e1d89-15c3-7658-a8dc-b8f8e6b782be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e1d89-15c3-7d0a-b07c-2b68674116b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e1d89-15c3-7658-a8dc-b8f8e6b782be" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e1d89-15c3-7d0a-b07c-2b68674116b1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-73f1-b252-c265985bfef1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e1d89-15c3-7d0a-b07c-2b68674116b1" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-73f1-b252-c265985bfef1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-73f1-b252-c265985bfef1_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-73f1-b252-c265985bfef1" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-73f1-b252-c265985bfef1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-737d-bdc3-11fbf450537d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-73f1-b252-c265985bfef1" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-737d-bdc3-11fbf450537d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-73a7-a490-d6ef73376af3" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-737d-bdc3-11fbf450537d" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-73a7-a490-d6ef73376af3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTextBlock_019e1d89-15c3-7b5f-96e5-cf480ae403c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e1d89-15c3-7658-a8dc-b8f8e6b782be" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTextBlock_019e1d89-15c3-7b5f-96e5-cf480ae403c5" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/SUBSEQUENTEVENTS" xlink:type="simple" xlink:href="sbgi-20260625.xsd#SUBSEQUENTEVENTS"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/SUBSEQUENTEVENTS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpSubsequentEventLineItems_019e1d89-15c3-7355-91b2-3ea3cf2ee4c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EbpSubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpSubsequentEventTable_019e1d89-15c3-71c5-98cd-256150caec91" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EbpSubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EbpSubsequentEventLineItems_019e1d89-15c3-7355-91b2-3ea3cf2ee4c7" xlink:to="loc_us-gaap-ebp_EbpSubsequentEventTable_019e1d89-15c3-71c5-98cd-256150caec91" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-7018-9dc0-25e19569fde9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EbpSubsequentEventTable_019e1d89-15c3-71c5-98cd-256150caec91" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-7018-9dc0-25e19569fde9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7018-9dc0-25e19569fde9_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7018-9dc0-25e19569fde9" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7018-9dc0-25e19569fde9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7536-ac6a-4752c40eef07" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7018-9dc0-25e19569fde9" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7536-ac6a-4752c40eef07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-77e3-9907-929677acda74" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-7536-ac6a-4752c40eef07" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-77e3-9907-929677acda74" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanSubsequentEventTextBlock_019e1d89-15c3-764c-acb7-e185ceb5a3a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanSubsequentEventTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EbpSubsequentEventLineItems_019e1d89-15c3-7355-91b2-3ea3cf2ee4c7" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanSubsequentEventTextBlock_019e1d89-15c3-764c-acb7-e185ceb5a3a6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/ScheduleHLine4iScheduleofAssetsHeldAtEndofYear" xlink:type="simple" xlink:href="sbgi-20260625.xsd#ScheduleHLine4iScheduleofAssetsHeldAtEndofYear"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/ScheduleHLine4iScheduleofAssetsHeldAtEndofYear" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7841-9b6b-26075b77dd10" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e1d89-15c3-7a1b-ab50-3bc009499094" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7841-9b6b-26075b77dd10" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e1d89-15c3-7a1b-ab50-3bc009499094" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-7bf4-8511-903ebe24faf5" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e1d89-15c3-7a1b-ab50-3bc009499094" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-7bf4-8511-903ebe24faf5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7bf4-8511-903ebe24faf5_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7bf4-8511-903ebe24faf5" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7bf4-8511-903ebe24faf5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7ac4-9a86-34df48b4ada0" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7bf4-8511-903ebe24faf5" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7ac4-9a86-34df48b4ada0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-7d7c-b159-ec35cac4f11f" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-7ac4-9a86-34df48b4ada0" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-7d7c-b159-ec35cac4f11f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTableTextBlock_019e1d89-15c3-7c93-bbdc-5bfdb941d4f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7841-9b6b-26075b77dd10" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTableTextBlock_019e1d89-15c3-7c93-bbdc-5bfdb941d4f1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies" xlink:type="simple" xlink:href="sbgi-20260625.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e1d89-15c3-74be-ab36-c56b71c95737" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e1d89-15c3-74df-abbf-e783453043d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e1d89-15c3-74be-ab36-c56b71c95737" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e1d89-15c3-74df-abbf-e783453043d5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-7764-aa24-3ab12574cb1e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e1d89-15c3-74df-abbf-e783453043d5" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-7764-aa24-3ab12574cb1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7764-aa24-3ab12574cb1e_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7764-aa24-3ab12574cb1e" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7764-aa24-3ab12574cb1e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7fe4-acb4-37d93510d59f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7764-aa24-3ab12574cb1e" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7fe4-acb4-37d93510d59f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-7119-b81d-06beaa529b11" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-7fe4-acb4-37d93510d59f" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-7119-b81d-06beaa529b11" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanUseOfEstimatePolicyTextBlock_019e2767-d1e9-749e-9417-3ba6f19937d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanUseOfEstimatePolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e1d89-15c3-74be-ab36-c56b71c95737" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanUseOfEstimatePolicyTextBlock_019e2767-d1e9-749e-9417-3ba6f19937d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanBasisOfAccountingPolicyTextBlock_019e2768-31b9-7f09-8650-779c00c5c1d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanBasisOfAccountingPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e1d89-15c3-74be-ab36-c56b71c95737" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanBasisOfAccountingPolicyTextBlock_019e2768-31b9-7f09-8650-779c00c5c1d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentPolicyTextBlock_019e276a-1eea-77f6-a177-28292ec1a31c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e1d89-15c3-74be-ab36-c56b71c95737" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentPolicyTextBlock_019e276a-1eea-77f6-a177-28292ec1a31c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantPolicyTextBlock_019e276a-9ffc-7344-97bc-7e43af347d2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e1d89-15c3-74be-ab36-c56b71c95737" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantPolicyTextBlock_019e276a-9ffc-7344-97bc-7e43af347d2e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPaymentToParticipantPolicyTextBlock_019e276a-f6b7-7ec0-82a8-79b7e8d82c9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanPaymentToParticipantPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e1d89-15c3-74be-ab36-c56b71c95737" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanPaymentToParticipantPolicyTextBlock_019e276a-f6b7-7ec0-82a8-79b7e8d82c9f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanExpensePolicyTextBlock_019e276b-706a-79db-bd10-688f8a369363" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanExpensePolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e1d89-15c3-74be-ab36-c56b71c95737" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanExpensePolicyTextBlock_019e276b-706a-79db-bd10-688f8a369363" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/FAIRVALUEMEASUREMENTSTables" xlink:type="simple" xlink:href="sbgi-20260625.xsd#FAIRVALUEMEASUREMENTSTables"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/FAIRVALUEMEASUREMENTSTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e1d89-15c3-7484-9483-23b4541396af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e1d89-15c3-7285-98cd-9c71e280fc1e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e1d89-15c3-7484-9483-23b4541396af" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e1d89-15c3-7285-98cd-9c71e280fc1e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-7c27-9bd2-d57604972358" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e1d89-15c3-7285-98cd-9c71e280fc1e" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-7c27-9bd2-d57604972358" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7c27-9bd2-d57604972358_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7c27-9bd2-d57604972358" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7c27-9bd2-d57604972358_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7486-89f7-5e273470eac9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7c27-9bd2-d57604972358" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7486-89f7-5e273470eac9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-7734-b992-8bbbaaad2129" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-7486-89f7-5e273470eac9" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-7734-b992-8bbbaaad2129" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTableTextBlock_019e74ba-3a56-7f81-93d2-7ba13b3451b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e1d89-15c3-7484-9483-23b4541396af" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTableTextBlock_019e74ba-3a56-7f81-93d2-7ba13b3451b9" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500Tables" xlink:type="simple" xlink:href="sbgi-20260625.xsd#DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500Tables"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500Tables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-793e-b298-044e48f79a4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e1d89-15c3-7761-ab84-4804650fbb34" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-793e-b298-044e48f79a4e" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e1d89-15c3-7761-ab84-4804650fbb34" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-7003-bb45-decf3ec328e8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e1d89-15c3-7761-ab84-4804650fbb34" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-7003-bb45-decf3ec328e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7003-bb45-decf3ec328e8_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7003-bb45-decf3ec328e8" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7003-bb45-decf3ec328e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7b77-a6e9-784518ed10d0" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7003-bb45-decf3ec328e8" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7b77-a6e9-784518ed10d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-72d6-bfe1-7b37331b001c" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-7b77-a6e9-784518ed10d0" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-72d6-bfe1-7b37331b001c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500TableTextBlock_019e1d89-15c3-729b-9bb8-57f0c1aa75df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500TableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-793e-b298-044e48f79a4e" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500TableTextBlock_019e1d89-15c3-729b-9bb8-57f0c1aa75df" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/PLANDESCRIPTIONDetails" xlink:type="simple" xlink:href="sbgi-20260625.xsd#PLANDESCRIPTIONDetails"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/PLANDESCRIPTIONDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e1d89-15c3-7279-af4a-46e5d72c701b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e1d89-15c3-7279-af4a-46e5d72c701b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-741a-8161-4307b3080d37" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e1d89-15c3-7279-af4a-46e5d72c701b" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-741a-8161-4307b3080d37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-741a-8161-4307b3080d37_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-741a-8161-4307b3080d37" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-741a-8161-4307b3080d37_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7237-a5da-f13068429bad" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-741a-8161-4307b3080d37" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7237-a5da-f13068429bad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-7c7d-91c2-56f1566605f7" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-7237-a5da-f13068429bad" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-7c7d-91c2-56f1566605f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPEmployerContributionMatchAxis_019e8363-18e7-74bf-aeb5-d63c58a0d5f8" xlink:href="sbgi-20260625.xsd#sbgi_EBPEmployerContributionMatchAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e1d89-15c3-7279-af4a-46e5d72c701b" xlink:to="loc_sbgi_EBPEmployerContributionMatchAxis_019e8363-18e7-74bf-aeb5-d63c58a0d5f8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPEmployerContributionMatchDomain_019e8363-18e7-74bf-aeb5-d63c58a0d5f8_default" xlink:href="sbgi-20260625.xsd#sbgi_EBPEmployerContributionMatchDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_sbgi_EBPEmployerContributionMatchAxis_019e8363-18e7-74bf-aeb5-d63c58a0d5f8" xlink:to="loc_sbgi_EBPEmployerContributionMatchDomain_019e8363-18e7-74bf-aeb5-d63c58a0d5f8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPEmployerContributionMatchDomain_019e8363-18e7-73d3-822d-61e910ec7cf6" xlink:href="sbgi-20260625.xsd#sbgi_EBPEmployerContributionMatchDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_sbgi_EBPEmployerContributionMatchAxis_019e8363-18e7-74bf-aeb5-d63c58a0d5f8" xlink:to="loc_sbgi_EBPEmployerContributionMatchDomain_019e8363-18e7-73d3-822d-61e910ec7cf6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPEmployerContributionMatchTrancheOneMember_019e8363-7650-7cc5-8bca-301c1487e213" xlink:href="sbgi-20260625.xsd#sbgi_EBPEmployerContributionMatchTrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_sbgi_EBPEmployerContributionMatchDomain_019e8363-18e7-73d3-822d-61e910ec7cf6" xlink:to="loc_sbgi_EBPEmployerContributionMatchTrancheOneMember_019e8363-7650-7cc5-8bca-301c1487e213" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPEmployerContributionMatchTrancheTwoMember_019e8363-c86e-7e39-9b79-bdb78b625f03" xlink:href="sbgi-20260625.xsd#sbgi_EBPEmployerContributionMatchTrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_sbgi_EBPEmployerContributionMatchDomain_019e8363-18e7-73d3-822d-61e910ec7cf6" xlink:to="loc_sbgi_EBPEmployerContributionMatchTrancheTwoMember_019e8363-c86e-7e39-9b79-bdb78b625f03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPEmployerContributionMatchTrancheThreeMember_019e838d-8ee8-7144-aa3f-270e21514f2a" xlink:href="sbgi-20260625.xsd#sbgi_EBPEmployerContributionMatchTrancheThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_sbgi_EBPEmployerContributionMatchDomain_019e8363-18e7-73d3-822d-61e910ec7cf6" xlink:to="loc_sbgi_EBPEmployerContributionMatchTrancheThreeMember_019e838d-8ee8-7144-aa3f-270e21514f2a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPVestingAxis_019edb6e-e115-7e26-b06b-4c06c03ef267" xlink:href="sbgi-20260625.xsd#sbgi_EBPVestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e1d89-15c3-7279-af4a-46e5d72c701b" xlink:to="loc_sbgi_EBPVestingAxis_019edb6e-e115-7e26-b06b-4c06c03ef267" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPVestingDomain_019edb6e-e115-7e26-b06b-4c06c03ef267_default" xlink:href="sbgi-20260625.xsd#sbgi_EBPVestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_sbgi_EBPVestingAxis_019edb6e-e115-7e26-b06b-4c06c03ef267" xlink:to="loc_sbgi_EBPVestingDomain_019edb6e-e115-7e26-b06b-4c06c03ef267_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPVestingDomain_019edb6e-e115-76d3-9cc3-77378bb4b5a1" xlink:href="sbgi-20260625.xsd#sbgi_EBPVestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_sbgi_EBPVestingAxis_019edb6e-e115-7e26-b06b-4c06c03ef267" xlink:to="loc_sbgi_EBPVestingDomain_019edb6e-e115-76d3-9cc3-77378bb4b5a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPVestingTrancheOneMember_019e8398-9e79-7340-a5e3-0e6d5bea9478" xlink:href="sbgi-20260625.xsd#sbgi_EBPVestingTrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_sbgi_EBPVestingDomain_019edb6e-e115-76d3-9cc3-77378bb4b5a1" xlink:to="loc_sbgi_EBPVestingTrancheOneMember_019e8398-9e79-7340-a5e3-0e6d5bea9478" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPVestingTrancheTwoMember_019e8398-de8b-7af2-a013-436addfd2bec" xlink:href="sbgi-20260625.xsd#sbgi_EBPVestingTrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_sbgi_EBPVestingDomain_019edb6e-e115-76d3-9cc3-77378bb4b5a1" xlink:to="loc_sbgi_EBPVestingTrancheTwoMember_019e8398-de8b-7af2-a013-436addfd2bec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPVestingTrancheThreeMember_019e8399-0935-7071-add5-1d65c79915bc" xlink:href="sbgi-20260625.xsd#sbgi_EBPVestingTrancheThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_sbgi_EBPVestingDomain_019edb6e-e115-76d3-9cc3-77378bb4b5a1" xlink:to="loc_sbgi_EBPVestingTrancheThreeMember_019e8399-0935-7071-add5-1d65c79915bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPVestingTrancheFourMember_019e8399-38ab-7eed-a68f-e5176d3869b2" xlink:href="sbgi-20260625.xsd#sbgi_EBPVestingTrancheFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_sbgi_EBPVestingDomain_019edb6e-e115-76d3-9cc3-77378bb4b5a1" xlink:to="loc_sbgi_EBPVestingTrancheFourMember_019e8399-38ab-7eed-a68f-e5176d3869b2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPVestingTrancheFiveMember_019e8399-6a82-7aa8-a734-1b73a60fa6c6" xlink:href="sbgi-20260625.xsd#sbgi_EBPVestingTrancheFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_sbgi_EBPVestingDomain_019edb6e-e115-76d3-9cc3-77378bb4b5a1" xlink:to="loc_sbgi_EBPVestingTrancheFiveMember_019e8399-6a82-7aa8-a734-1b73a60fa6c6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPRequisiteServicePeriod_019edb57-ec71-703a-914d-5cd57530876d" xlink:href="sbgi-20260625.xsd#sbgi_EBPRequisiteServicePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_sbgi_EBPRequisiteServicePeriod_019edb57-ec71-703a-914d-5cd57530876d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPEmployerContributionMatchServicePeriod_019edb5a-2f1d-73e4-b276-13acbd7fc332" xlink:href="sbgi-20260625.xsd#sbgi_EBPEmployerContributionMatchServicePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_sbgi_EBPEmployerContributionMatchServicePeriod_019edb5a-2f1d-73e4-b276-13acbd7fc332" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPRequisiteServicePeriodHourlyRequirement_019edb63-dffc-7a2c-90f6-da5d290e9e10" xlink:href="sbgi-20260625.xsd#sbgi_EBPRequisiteServicePeriodHourlyRequirement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_sbgi_EBPRequisiteServicePeriodHourlyRequirement_019edb63-dffc-7a2c-90f6-da5d290e9e10" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPWeeklyEligibilityCreditPeriod_019edb5f-ab1a-7669-8508-64a57a7ad708" xlink:href="sbgi-20260625.xsd#sbgi_EBPWeeklyEligibilityCreditPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_sbgi_EBPWeeklyEligibilityCreditPeriod_019edb5f-ab1a-7669-8508-64a57a7ad708" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionPretaxMaximumAnnualCompensationToTotalCompensationPercentage_019e835b-ab96-77d7-a896-b6fc355c156d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantContributionPretaxMaximumAnnualCompensationToTotalCompensationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionPretaxMaximumAnnualCompensationToTotalCompensationPercentage_019e835b-ab96-77d7-a896-b6fc355c156d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage_019e835d-b49e-7d93-81b4-b6e1f67ea084" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage_019e835d-b49e-7d93-81b4-b6e1f67ea084" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage_019e8389-629a-7929-945b-8f2b5cdc9adf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage_019e8389-629a-7929-945b-8f2b5cdc9adf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPEmployerContributionVestingPercentage_019e8387-d285-72b4-abcf-59866584335b" xlink:href="sbgi-20260625.xsd#sbgi_EBPEmployerContributionVestingPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_sbgi_EBPEmployerContributionVestingPercentage_019e8387-d285-72b4-abcf-59866584335b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPEmployerContributionVestingServicePeriod_019e8393-0c5c-7041-a69b-54c283bf0bb4" xlink:href="sbgi-20260625.xsd#sbgi_EBPEmployerContributionVestingServicePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_sbgi_EBPEmployerContributionVestingServicePeriod_019e8393-0c5c-7041-a69b-54c283bf0bb4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPTerminatingMemberMinimumBalanceToMaintainAccount_019e83a5-b321-7902-bbef-8105619cfaec" xlink:href="sbgi-20260625.xsd#sbgi_EBPTerminatingMemberMinimumBalanceToMaintainAccount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_sbgi_EBPTerminatingMemberMinimumBalanceToMaintainAccount_019e83a5-b321-7902-bbef-8105619cfaec" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccount_019e839f-ce44-7858-92c8-d10107af0371" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccount_019e839f-ce44-7858-92c8-d10107af0371" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccountDecreaseForEmployerContribution_019edb33-af89-7300-9ed1-d2a27e8ba36c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccountDecreaseForEmployerContribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccountDecreaseForEmployerContribution_019edb33-af89-7300-9ed1-d2a27e8ba36c" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanExcessContributionPayable_019e27df-563a-7df5-ae85-cdecc568845e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanExcessContributionPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanExcessContributionPayable_019e27df-563a-7df5-ae85-cdecc568845e" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount_019e27d2-1033-7f0f-bc25-bb4d446af0a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount_019e27d2-1033-7f0f-bc25-bb4d446af0a1" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount_019e27d2-58e8-76a4-a26a-40bde236d511" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount_019e27d2-58e8-76a4-a26a-40bde236d511" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage_019e27da-7913-79b3-8499-5597a6d5d80d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage_019e27da-7913-79b3-8499-5597a6d5d80d" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPParticipantLoanBasisSpreadOnVariableRate_019e27d7-8a07-7225-bbd3-497164b08787" xlink:href="sbgi-20260625.xsd#sbgi_EBPParticipantLoanBasisSpreadOnVariableRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_sbgi_EBPParticipantLoanBasisSpreadOnVariableRate_019e27d7-8a07-7225-bbd3-497164b08787" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPNoteReceivableFromParticipantMaximumNumberOfLoansOutstandingAtOneTime_019edb8a-13b9-703b-be22-6bcadb324fea" xlink:href="sbgi-20260625.xsd#sbgi_EBPNoteReceivableFromParticipantMaximumNumberOfLoansOutstandingAtOneTime"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_sbgi_EBPNoteReceivableFromParticipantMaximumNumberOfLoansOutstandingAtOneTime_019edb8a-13b9-703b-be22-6bcadb324fea" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPNoteReceivableFromParticipantMaximumBorrowingTerm_019edb85-9646-7f05-b6a2-980994f3d06c" xlink:href="sbgi-20260625.xsd#sbgi_EBPNoteReceivableFromParticipantMaximumBorrowingTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e1d89-15c3-730d-8ae0-16b2201d134f" xlink:to="loc_sbgi_EBPNoteReceivableFromParticipantMaximumBorrowingTerm_019edb85-9646-7f05-b6a2-980994f3d06c" xlink:type="arc" order="18"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESDetails" xlink:type="simple" xlink:href="sbgi-20260625.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESDetails"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e276d-2caa-774a-b909-c8b082e2a67d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e276d-2caa-77df-9b20-b5ea39f856bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e276d-2caa-774a-b909-c8b082e2a67d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e276d-2caa-77df-9b20-b5ea39f856bc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e276d-2caa-7908-8fd4-899de196f107" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e276d-2caa-77df-9b20-b5ea39f856bc" xlink:to="loc_dei_LegalEntityAxis_019e276d-2caa-7908-8fd4-899de196f107" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e276d-2caa-7908-8fd4-899de196f107_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e276d-2caa-7908-8fd4-899de196f107" xlink:to="loc_dei_EntityDomain_019e276d-2caa-7908-8fd4-899de196f107_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e276d-2caa-700b-ba42-ce2405ad2f02" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e276d-2caa-7908-8fd4-899de196f107" xlink:to="loc_dei_EntityDomain_019e276d-2caa-700b-ba42-ce2405ad2f02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e276d-2caa-76fb-ae98-9f4fff56691a" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e276d-2caa-700b-ba42-ce2405ad2f02" xlink:to="loc_sbgi_EBP001Member_019e276d-2caa-76fb-ae98-9f4fff56691a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAllowanceForCreditLoss_019e276d-2caa-7491-b8ba-bc3aea20d642" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e276d-2caa-774a-b909-c8b082e2a67d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAllowanceForCreditLoss_019e276d-2caa-7491-b8ba-bc3aea20d642" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/FAIRVALUEMEASUREMENTSInvestmentsMeasuredatFairValueonaRecurringBasisDetails" xlink:type="simple" xlink:href="sbgi-20260625.xsd#FAIRVALUEMEASUREMENTSInvestmentsMeasuredatFairValueonaRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/FAIRVALUEMEASUREMENTSInvestmentsMeasuredatFairValueonaRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e1d89-15c3-72da-ac41-96c587cb3bcb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e1d89-15c3-73d6-8741-38774280d4bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e1d89-15c3-72da-ac41-96c587cb3bcb" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e1d89-15c3-73d6-8741-38774280d4bb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-7aec-9599-49616bd121ed" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e1d89-15c3-73d6-8741-38774280d4bb" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-7aec-9599-49616bd121ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7aec-9599-49616bd121ed_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7aec-9599-49616bd121ed" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7aec-9599-49616bd121ed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7663-a08c-d7c50dfa8dd3" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7aec-9599-49616bd121ed" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7663-a08c-d7c50dfa8dd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-7ec8-b1b0-eb6595833129" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-7663-a08c-d7c50dfa8dd3" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-7ec8-b1b0-eb6595833129" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e279a-0467-79b4-aee6-7f0016fabb15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e1d89-15c3-73d6-8741-38774280d4bb" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e279a-0467-79b4-aee6-7f0016fabb15" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e279a-0467-79b4-aee6-7f0016fabb15_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e279a-0467-79b4-aee6-7f0016fabb15" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e279a-0467-79b4-aee6-7f0016fabb15_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e279a-0468-7069-8684-e4c2eab26774" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e279a-0467-79b4-aee6-7f0016fabb15" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e279a-0468-7069-8684-e4c2eab26774" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel12And3Member_019e279b-3791-7932-82d1-683c61fbb716" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel12And3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e279a-0468-7069-8684-e4c2eab26774" xlink:to="loc_us-gaap_FairValueInputsLevel12And3Member_019e279b-3791-7932-82d1-683c61fbb716" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e279a-0468-727c-a85e-ee3b730ee915" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInputsLevel12And3Member_019e279b-3791-7932-82d1-683c61fbb716" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e279a-0468-727c-a85e-ee3b730ee915" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e279a-0468-72ef-aa00-c3a0ae68f527" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInputsLevel12And3Member_019e279b-3791-7932-82d1-683c61fbb716" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e279a-0468-72ef-aa00-c3a0ae68f527" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e279a-a2b1-7a96-9f58-d2cbe3f7dc85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInputsLevel12And3Member_019e279b-3791-7932-82d1-683c61fbb716" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e279a-a2b1-7a96-9f58-d2cbe3f7dc85" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019e27a0-c290-704f-aaa2-26540a57d4c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e279a-0468-7069-8684-e4c2eab26774" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019e27a0-c290-704f-aaa2-26540a57d4c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019e279a-0468-7c96-aa7b-a122fdb3643e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e1d89-15c3-73d6-8741-38774280d4bb" xlink:to="loc_us-gaap_InvestmentTypeAxis_019e279a-0468-7c96-aa7b-a122fdb3643e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e279a-0468-7c96-aa7b-a122fdb3643e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e279a-0468-7c96-aa7b-a122fdb3643e" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e279a-0468-7c96-aa7b-a122fdb3643e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e279a-0468-7f9c-8b96-c6046b678255" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e279a-0468-7c96-aa7b-a122fdb3643e" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e279a-0468-7f9c-8b96-c6046b678255" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MutualFundMember_019e279a-0468-76a6-9109-468910856885" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MutualFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e279a-0468-7f9c-8b96-c6046b678255" xlink:to="loc_us-gaap_MutualFundMember_019e279a-0468-76a6-9109-468910856885" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockFundMember_019e279f-fbf9-7652-9ca7-81a6d27a7c44" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e279a-0468-7f9c-8b96-c6046b678255" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockFundMember_019e279f-fbf9-7652-9ca7-81a6d27a7c44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember_019e27a2-4ccd-7e40-a2b3-846a2d7ccfcd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e279a-0468-7f9c-8b96-c6046b678255" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember_019e27a2-4ccd-7e40-a2b3-846a2d7ccfcd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember_019e27a0-c290-79ee-8729-ba9084566c56" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e279a-0468-7f9c-8b96-c6046b678255" xlink:to="loc_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember_019e27a0-c290-79ee-8729-ba9084566c56" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_019e279a-0468-74d9-8df7-cce08d00cb8d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e1d89-15c3-72da-ac41-96c587cb3bcb" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_019e279a-0468-74d9-8df7-cce08d00cb8d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/FAIRVALUEMEASUREMENTSAdditionalInformationDetails" xlink:type="simple" xlink:href="sbgi-20260625.xsd#FAIRVALUEMEASUREMENTSAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/FAIRVALUEMEASUREMENTSAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e7506-600a-762d-a3c1-f490ec7992d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e7506-600a-7734-b4bf-3096e1bca7bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e7506-600a-762d-a3c1-f490ec7992d7" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e7506-600a-7734-b4bf-3096e1bca7bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e7506-600a-7128-b9b0-9d3bb7215ef7" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e7506-600a-7734-b4bf-3096e1bca7bd" xlink:to="loc_dei_LegalEntityAxis_019e7506-600a-7128-b9b0-9d3bb7215ef7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e7506-600a-7128-b9b0-9d3bb7215ef7_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e7506-600a-7128-b9b0-9d3bb7215ef7" xlink:to="loc_dei_EntityDomain_019e7506-600a-7128-b9b0-9d3bb7215ef7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e7506-600a-7350-b6e0-5563c8959724" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e7506-600a-7128-b9b0-9d3bb7215ef7" xlink:to="loc_dei_EntityDomain_019e7506-600a-7350-b6e0-5563c8959724" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e7507-ac1d-7ec3-8f42-2552656ac2ff" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e7506-600a-7350-b6e0-5563c8959724" xlink:to="loc_sbgi_EBP001Member_019e7507-ac1d-7ec3-8f42-2552656ac2ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019e7506-600a-7884-91fc-0ae2ae35df6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e7506-600a-7734-b4bf-3096e1bca7bd" xlink:to="loc_us-gaap_InvestmentTypeAxis_019e7506-600a-7884-91fc-0ae2ae35df6b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e7506-600a-7884-91fc-0ae2ae35df6b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e7506-600a-7884-91fc-0ae2ae35df6b" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e7506-600a-7884-91fc-0ae2ae35df6b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e7506-600a-7de1-b471-25da238b3127" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e7506-600a-7884-91fc-0ae2ae35df6b" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e7506-600a-7de1-b471-25da238b3127" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockFundMember_019e7507-773e-7b75-aac6-692d20c17d33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e7506-600a-7de1-b471-25da238b3127" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockFundMember_019e7507-773e-7b75-aac6-692d20c17d33" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019edb4f-1470-797e-99f4-7a2cc54d2876" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e7506-600a-7de1-b471-25da238b3127" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019edb4f-1470-797e-99f4-7a2cc54d2876" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares_019e7506-b14a-74b3-9c90-ba3cd941d606" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e7506-600a-762d-a3c1-f490ec7992d7" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares_019e7506-b14a-74b3-9c90-ba3cd941d606" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPSharePrice_019e7516-e199-751e-be58-586cea1159a8" xlink:href="sbgi-20260625.xsd#sbgi_EBPSharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e7506-600a-762d-a3c1-f490ec7992d7" xlink:to="loc_sbgi_EBPSharePrice_019e7516-e199-751e-be58-586cea1159a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentSoldExcludingPlanInterestInMasterTrustCost_019e750b-21ec-7555-9abb-726dd180d193" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentSoldExcludingPlanInterestInMasterTrustCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e7506-600a-762d-a3c1-f490ec7992d7" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentSoldExcludingPlanInterestInMasterTrustCost_019e750b-21ec-7555-9abb-726dd180d193" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentAcquiredExcludingPlanInterestInMasterTrustCost_019e750b-da5a-7194-bdaa-f4c88332cc74" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentAcquiredExcludingPlanInterestInMasterTrustCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e7506-600a-762d-a3c1-f490ec7992d7" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentAcquiredExcludingPlanInterestInMasterTrustCost_019e750b-da5a-7194-bdaa-f4c88332cc74" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/FAIRVALUEMEASUREMENTSInvestmentsUsingNetUnitValuePerSharePracticalExpedientDetails" xlink:type="simple" xlink:href="sbgi-20260625.xsd#FAIRVALUEMEASUREMENTSInvestmentsUsingNetUnitValuePerSharePracticalExpedientDetails"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/FAIRVALUEMEASUREMENTSInvestmentsUsingNetUnitValuePerSharePracticalExpedientDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e27b5-9d63-75c4-aad9-6666e22861f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e27b5-9d63-7282-a43e-43a8e6236b58" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e27b5-9d63-75c4-aad9-6666e22861f9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e27b5-9d63-7282-a43e-43a8e6236b58" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e27b5-9d63-77cb-a7fe-d3f77595c677" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e27b5-9d63-7282-a43e-43a8e6236b58" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e27b5-9d63-77cb-a7fe-d3f77595c677" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e27b5-9d63-77cb-a7fe-d3f77595c677_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e27b5-9d63-77cb-a7fe-d3f77595c677" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e27b5-9d63-77cb-a7fe-d3f77595c677_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e27b5-9d63-7d8a-a474-437b39abdabb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e27b5-9d63-77cb-a7fe-d3f77595c677" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e27b5-9d63-7d8a-a474-437b39abdabb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019e27b5-9d63-7ce7-b589-5dfb565e24ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e27b5-9d63-7d8a-a474-437b39abdabb" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019e27b5-9d63-7ce7-b589-5dfb565e24ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019e27b5-9d63-7afa-944a-034c94c3cb41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e27b5-9d63-7282-a43e-43a8e6236b58" xlink:to="loc_us-gaap_InvestmentTypeAxis_019e27b5-9d63-7afa-944a-034c94c3cb41" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e27b5-9d63-7afa-944a-034c94c3cb41_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e27b5-9d63-7afa-944a-034c94c3cb41" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e27b5-9d63-7afa-944a-034c94c3cb41_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e27b5-9d63-7e2c-9728-7577a79ca7d8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e27b5-9d63-7afa-944a-034c94c3cb41" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e27b5-9d63-7e2c-9728-7577a79ca7d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember_019e27b5-9d63-731f-8d25-c5e6e7650b48" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e27b5-9d63-7e2c-9728-7577a79ca7d8" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember_019e27b5-9d63-731f-8d25-c5e6e7650b48" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember_019e27b5-9d63-7668-b41f-40d7a3538fd4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e27b5-9d63-7e2c-9728-7577a79ca7d8" xlink:to="loc_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember_019e27b5-9d63-7668-b41f-40d7a3538fd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e27b5-9d63-74f7-93dc-9d3df0a4963a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e27b5-9d63-7282-a43e-43a8e6236b58" xlink:to="loc_dei_LegalEntityAxis_019e27b5-9d63-74f7-93dc-9d3df0a4963a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e27b5-9d63-74f7-93dc-9d3df0a4963a_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e27b5-9d63-74f7-93dc-9d3df0a4963a" xlink:to="loc_dei_EntityDomain_019e27b5-9d63-74f7-93dc-9d3df0a4963a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e27b5-9d63-778a-a681-11c52bf163ee" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e27b5-9d63-74f7-93dc-9d3df0a4963a" xlink:to="loc_dei_EntityDomain_019e27b5-9d63-778a-a681-11c52bf163ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e27b5-9d63-74c4-859c-e35345bc6868" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e27b5-9d63-778a-a681-11c52bf163ee" xlink:to="loc_sbgi_EBP001Member_019e27b5-9d63-74c4-859c-e35345bc6868" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_019e27b5-9d63-7cd3-b51f-f2fc2740bbe8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e27b5-9d63-75c4-aad9-6666e22861f9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_019e27b5-9d63-7cd3-b51f-f2fc2740bbe8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpFairValueInvestmentNavUnfundedCommitment_019edb47-87f3-799c-a1d1-684fffdfc881" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EbpFairValueInvestmentNavUnfundedCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e27b5-9d63-75c4-aad9-6666e22861f9" xlink:to="loc_us-gaap-ebp_EbpFairValueInvestmentNavUnfundedCommitment_019edb47-87f3-799c-a1d1-684fffdfc881" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpFairValueInvestmentNavRedemptionNoticePeriod_019e74bd-1e47-7694-a0e0-10198c0cde3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EbpFairValueInvestmentNavRedemptionNoticePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e27b5-9d63-75c4-aad9-6666e22861f9" xlink:to="loc_us-gaap-ebp_EbpFairValueInvestmentNavRedemptionNoticePeriod_019e74bd-1e47-7694-a0e0-10198c0cde3f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500ReconciliationofNetAssetsAvailableforBenefitsDetails" xlink:type="simple" xlink:href="sbgi-20260625.xsd#DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500ReconciliationofNetAssetsAvailableforBenefitsDetails"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500ReconciliationofNetAssetsAvailableforBenefitsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-7bb5-aeb6-d09ff18e1978" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e1d89-15c3-7870-b072-d172d36e1ed0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-7bb5-aeb6-d09ff18e1978" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e1d89-15c3-7870-b072-d172d36e1ed0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-7544-ad4b-e7344dc2c352" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e1d89-15c3-7870-b072-d172d36e1ed0" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-7544-ad4b-e7344dc2c352" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7544-ad4b-e7344dc2c352_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7544-ad4b-e7344dc2c352" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7544-ad4b-e7344dc2c352_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7cbe-901c-61e5dc47a97f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7544-ad4b-e7344dc2c352" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7cbe-901c-61e5dc47a97f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-733a-8a4c-fdb20d3ed83d" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-7cbe-901c-61e5dc47a97f" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-733a-8a4c-fdb20d3ed83d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019e414d-6329-7cd7-ab01-a0f535126bea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-7bb5-aeb6-d09ff18e1978" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019e414d-6329-7cd7-ab01-a0f535126bea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPReconciliationToForm5500CaptionReceivablesParticipantContributions_019e4152-d33d-7b78-9d8e-ae2bc948b09d" xlink:href="sbgi-20260625.xsd#sbgi_EBPReconciliationToForm5500CaptionReceivablesParticipantContributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-7bb5-aeb6-d09ff18e1978" xlink:to="loc_sbgi_EBPReconciliationToForm5500CaptionReceivablesParticipantContributions_019e4152-d33d-7b78-9d8e-ae2bc948b09d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPReconciliationToForm5500CaptionReceivablesEmployerContributions_019e4152-85b0-7e75-9310-e4e01ba01848" xlink:href="sbgi-20260625.xsd#sbgi_EBPReconciliationToForm5500CaptionReceivablesEmployerContributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-7bb5-aeb6-d09ff18e1978" xlink:to="loc_sbgi_EBPReconciliationToForm5500CaptionReceivablesEmployerContributions_019e4152-85b0-7e75-9310-e4e01ba01848" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPReconciliationToForm5500CaptionExcessContributionPayable_019e4155-91c7-7f02-90b2-ba80fcb55bf8" xlink:href="sbgi-20260625.xsd#sbgi_EBPReconciliationToForm5500CaptionExcessContributionPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-7bb5-aeb6-d09ff18e1978" xlink:to="loc_sbgi_EBPReconciliationToForm5500CaptionExcessContributionPayable_019e4155-91c7-7f02-90b2-ba80fcb55bf8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanForm5500CaptionNetAssetAvailableForBenefit_019e414d-f422-746b-852f-f4cb7d4ea926" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanForm5500CaptionNetAssetAvailableForBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-7bb5-aeb6-d09ff18e1978" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanForm5500CaptionNetAssetAvailableForBenefit_019e414d-f422-746b-852f-f4cb7d4ea926" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500ReconciliationofEmployerContributionsDetails" xlink:type="simple" xlink:href="sbgi-20260625.xsd#DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500ReconciliationofEmployerContributionsDetails"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500ReconciliationofEmployerContributionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-77d4-b959-d3c61ff9af64" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e1d89-15c3-7007-b426-384535fcf91f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-77d4-b959-d3c61ff9af64" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e1d89-15c3-7007-b426-384535fcf91f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-7d1e-b433-20a22ff18512" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e1d89-15c3-7007-b426-384535fcf91f" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-7d1e-b433-20a22ff18512" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7d1e-b433-20a22ff18512_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7d1e-b433-20a22ff18512" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7d1e-b433-20a22ff18512_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7c76-8566-d038ef843bca" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7d1e-b433-20a22ff18512" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7c76-8566-d038ef843bca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-7ef4-8be9-cabe83370bc0" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-7c76-8566-d038ef843bca" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-7ef4-8be9-cabe83370bc0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash_019e74eb-8b08-75a8-99d3-fbe6c3dea2eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-77d4-b959-d3c61ff9af64" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash_019e74eb-8b08-75a8-99d3-fbe6c3dea2eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPReconciliationToForm5500ContributionsEmployersCurrentPeriodDecreaseForContributionReceivable_019eeffb-9fde-735a-b6bb-9334c68b42e8" xlink:href="sbgi-20260625.xsd#sbgi_EBPReconciliationToForm5500ContributionsEmployersCurrentPeriodDecreaseForContributionReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-77d4-b959-d3c61ff9af64" xlink:to="loc_sbgi_EBPReconciliationToForm5500ContributionsEmployersCurrentPeriodDecreaseForContributionReceivable_019eeffb-9fde-735a-b6bb-9334c68b42e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPReconciliationToForm5500ContributionsEmployersPriorPeriodIncreaseForContributionReceivable_019e83de-5835-70e8-86d8-05df57603558" xlink:href="sbgi-20260625.xsd#sbgi_EBPReconciliationToForm5500ContributionsEmployersPriorPeriodIncreaseForContributionReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-77d4-b959-d3c61ff9af64" xlink:to="loc_sbgi_EBPReconciliationToForm5500ContributionsEmployersPriorPeriodIncreaseForContributionReceivable_019e83de-5835-70e8-86d8-05df57603558" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanForm5500CaptionEmployerContribution_019e7571-1d19-788e-94a0-dfdd395625ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanForm5500CaptionEmployerContribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e1d89-15c3-77d4-b959-d3c61ff9af64" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanForm5500CaptionEmployerContribution_019e7571-1d19-788e-94a0-dfdd395625ba" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500ReconciliationofEmployeeContributionsDetails" xlink:type="simple" xlink:href="sbgi-20260625.xsd#DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500ReconciliationofEmployeeContributionsDetails"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500ReconciliationofEmployeeContributionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e83e4-3de9-7f6d-b14a-1289d8d22f3d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e83e4-3de9-7b8e-818b-803ddef632a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e83e4-3de9-7f6d-b14a-1289d8d22f3d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e83e4-3de9-7b8e-818b-803ddef632a5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e83e4-3de9-779b-b710-f79f5a5ee2a3" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e83e4-3de9-7b8e-818b-803ddef632a5" xlink:to="loc_dei_LegalEntityAxis_019e83e4-3de9-779b-b710-f79f5a5ee2a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e83e4-3de9-779b-b710-f79f5a5ee2a3_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e83e4-3de9-779b-b710-f79f5a5ee2a3" xlink:to="loc_dei_EntityDomain_019e83e4-3de9-779b-b710-f79f5a5ee2a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e83e4-3de9-78af-b36e-2ffa2d643a60" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e83e4-3de9-779b-b710-f79f5a5ee2a3" xlink:to="loc_dei_EntityDomain_019e83e4-3de9-78af-b36e-2ffa2d643a60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e83e4-3de9-7b67-b697-fcb276440211" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e83e4-3de9-78af-b36e-2ffa2d643a60" xlink:to="loc_sbgi_EBP001Member_019e83e4-3de9-7b67-b697-fcb276440211" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionExcludingRollover_019e83e4-3de9-7e18-83cf-eb8095c2e6e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionExcludingRollover"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e83e4-3de9-7f6d-b14a-1289d8d22f3d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionExcludingRollover_019e83e4-3de9-7e18-83cf-eb8095c2e6e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPReconciliationToForm5500ContributionsParticipantContributionCurrentPeriodDecreaseForContributionReceivable_019ef004-bbfb-7385-a57d-d93c5657a52e" xlink:href="sbgi-20260625.xsd#sbgi_EBPReconciliationToForm5500ContributionsParticipantContributionCurrentPeriodDecreaseForContributionReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e83e4-3de9-7f6d-b14a-1289d8d22f3d" xlink:to="loc_sbgi_EBPReconciliationToForm5500ContributionsParticipantContributionCurrentPeriodDecreaseForContributionReceivable_019ef004-bbfb-7385-a57d-d93c5657a52e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPReconciliationToForm5500ContributionsParticipantContributionPriorPeriodIncreaseForContributionReceivable_019e83e7-4d7c-7609-bd76-a00c8af094b7" xlink:href="sbgi-20260625.xsd#sbgi_EBPReconciliationToForm5500ContributionsParticipantContributionPriorPeriodIncreaseForContributionReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e83e4-3de9-7f6d-b14a-1289d8d22f3d" xlink:to="loc_sbgi_EBPReconciliationToForm5500ContributionsParticipantContributionPriorPeriodIncreaseForContributionReceivable_019e83e7-4d7c-7609-bd76-a00c8af094b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPChangeInNetAssetAvailableForBenefitIncreaseFromParticipantContributionCorrectiveDistributions_019e83ce-bd65-7637-93ac-e465d3a07d0f" xlink:href="sbgi-20260625.xsd#sbgi_EBPChangeInNetAssetAvailableForBenefitIncreaseFromParticipantContributionCorrectiveDistributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e83e4-3de9-7f6d-b14a-1289d8d22f3d" xlink:to="loc_sbgi_EBPChangeInNetAssetAvailableForBenefitIncreaseFromParticipantContributionCorrectiveDistributions_019e83ce-bd65-7637-93ac-e465d3a07d0f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanForm5500CaptionParticipantContribution_019e74f0-08b2-74ff-b92b-6b7732ff90d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanForm5500CaptionParticipantContribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e83e4-3de9-7f6d-b14a-1289d8d22f3d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanForm5500CaptionParticipantContribution_019e74f0-08b2-74ff-b92b-6b7732ff90d4" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500ReconciliationofCorrectiveDistributionsDetails" xlink:type="simple" xlink:href="sbgi-20260625.xsd#DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500ReconciliationofCorrectiveDistributionsDetails"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/DIFFERENCESBETWEENFINANCIALSTATEMENTSANDFORM5500ReconciliationofCorrectiveDistributionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e83e8-3dee-761a-ab26-d0fa2d3b4862" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e83e8-3dee-7573-aea9-12753fa24c11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e83e8-3dee-761a-ab26-d0fa2d3b4862" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e83e8-3dee-7573-aea9-12753fa24c11" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e83e8-3dee-71e8-b5dd-6accd56c276b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500Table_019e83e8-3dee-7573-aea9-12753fa24c11" xlink:to="loc_dei_LegalEntityAxis_019e83e8-3dee-71e8-b5dd-6accd56c276b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e83e8-3dee-71e8-b5dd-6accd56c276b_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e83e8-3dee-71e8-b5dd-6accd56c276b" xlink:to="loc_dei_EntityDomain_019e83e8-3dee-71e8-b5dd-6accd56c276b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e83e8-3dee-771d-8bfa-868434956d10" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e83e8-3dee-71e8-b5dd-6accd56c276b" xlink:to="loc_dei_EntityDomain_019e83e8-3dee-771d-8bfa-868434956d10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e83e8-3dee-7fac-83e6-049d3ffa6b27" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e83e8-3dee-771d-8bfa-868434956d10" xlink:to="loc_sbgi_EBP001Member_019e83e8-3dee-7fac-83e6-049d3ffa6b27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPCorrectiveDistributions_019e83e8-3dee-7d5a-aee0-0511b2238a8b" xlink:href="sbgi-20260625.xsd#sbgi_EBPCorrectiveDistributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e83e8-3dee-761a-ab26-d0fa2d3b4862" xlink:to="loc_sbgi_EBPCorrectiveDistributions_019e83e8-3dee-7d5a-aee0-0511b2238a8b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPReconciliationToForm5500ContributionsCurrentPeriodDecreaseFromExcessContributionsRefundable_019ef09e-bebe-7ee0-bb66-4a69a927b628" xlink:href="sbgi-20260625.xsd#sbgi_EBPReconciliationToForm5500ContributionsCurrentPeriodDecreaseFromExcessContributionsRefundable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e83e8-3dee-761a-ab26-d0fa2d3b4862" xlink:to="loc_sbgi_EBPReconciliationToForm5500ContributionsCurrentPeriodDecreaseFromExcessContributionsRefundable_019ef09e-bebe-7ee0-bb66-4a69a927b628" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBPReconciliationToForm5500ContributionsPriorPeriodIncreaseForExcessContributionsRefundable_019e83c5-a1fd-7f64-81e5-1b7fc39b48a0" xlink:href="sbgi-20260625.xsd#sbgi_EBPReconciliationToForm5500ContributionsPriorPeriodIncreaseForExcessContributionsRefundable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e83e8-3dee-761a-ab26-d0fa2d3b4862" xlink:to="loc_sbgi_EBPReconciliationToForm5500ContributionsPriorPeriodIncreaseForExcessContributionsRefundable_019e83c5-a1fd-7f64-81e5-1b7fc39b48a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanForm5500CaptionCorrectiveDistribution_019e74fc-cdbd-7635-848f-db390e4af38d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanForm5500CaptionCorrectiveDistribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReconciliationToForm5500LineItems_019e83e8-3dee-761a-ab26-d0fa2d3b4862" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanForm5500CaptionCorrectiveDistribution_019e74fc-cdbd-7635-848f-db390e4af38d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/RELATEDPARTYANDPARTIESININTERESTTRANSACTIONSDetails" xlink:type="simple" xlink:href="sbgi-20260625.xsd#RELATEDPARTYANDPARTIESININTERESTTRANSACTIONSDetails"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/RELATEDPARTYANDPARTIESININTERESTTRANSACTIONSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e1d89-15c3-7438-9f29-90c65aa9436a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e1d89-15c3-7487-a1ff-884348590c11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e1d89-15c3-7438-9f29-90c65aa9436a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e1d89-15c3-7487-a1ff-884348590c11" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-70ba-b2b6-3e34394b5bbb" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e1d89-15c3-7487-a1ff-884348590c11" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-70ba-b2b6-3e34394b5bbb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-70ba-b2b6-3e34394b5bbb_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-70ba-b2b6-3e34394b5bbb" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-70ba-b2b6-3e34394b5bbb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7acc-bf5e-9949ac8551b7" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-70ba-b2b6-3e34394b5bbb" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7acc-bf5e-9949ac8551b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-7834-8172-2ab7b0d0af60" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-7acc-bf5e-9949ac8551b7" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-7834-8172-2ab7b0d0af60" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestAxis_019edb37-ea99-7698-b71b-a80a0006bfd1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e1d89-15c3-7487-a1ff-884348590c11" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestAxis_019edb37-ea99-7698-b71b-a80a0006bfd1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestDomain_019edb37-ea99-7698-b71b-a80a0006bfd1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestAxis_019edb37-ea99-7698-b71b-a80a0006bfd1" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestDomain_019edb37-ea99-7698-b71b-a80a0006bfd1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestDomain_019edb37-ea99-7023-a7f2-1f61747b89e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestAxis_019edb37-ea99-7698-b71b-a80a0006bfd1" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestDomain_019edb37-ea99-7023-a7f2-1f61747b89e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTrusteeMember_019edb38-489b-7a55-af8d-8b366268fb03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanTrusteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestDomain_019edb37-ea99-7023-a7f2-1f61747b89e8" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanTrusteeMember_019edb38-489b-7a55-af8d-8b366268fb03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019edb3a-a9ba-7f6a-93af-6ab67705fda1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e1d89-15c3-7487-a1ff-884348590c11" xlink:to="loc_us-gaap_InvestmentTypeAxis_019edb3a-a9ba-7f6a-93af-6ab67705fda1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019edb3a-a9ba-7f6a-93af-6ab67705fda1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019edb3a-a9ba-7f6a-93af-6ab67705fda1" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019edb3a-a9ba-7f6a-93af-6ab67705fda1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019edb3a-a9ba-71a2-9805-c5f13ed11a2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019edb3a-a9ba-7f6a-93af-6ab67705fda1" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019edb3a-a9ba-71a2-9805-c5f13ed11a2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019edb3b-05cc-7b1c-a46b-7c931eeb198e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019edb3a-a9ba-71a2-9805-c5f13ed11a2d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019edb3b-05cc-7b1c-a46b-7c931eeb198e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash_019edb39-d303-716f-8123-0ad964e4745f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e1d89-15c3-7438-9f29-90c65aa9436a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash_019edb39-d303-716f-8123-0ad964e4745f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable_019e757d-1025-7461-8e91-13cf0f603c1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e1d89-15c3-7438-9f29-90c65aa9436a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable_019e757d-1025-7461-8e91-13cf0f603c1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment_019e7575-f0aa-7db7-9b70-1cb195f1ee72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e1d89-15c3-7438-9f29-90c65aa9436a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment_019e7575-f0aa-7db7-9b70-1cb195f1ee72" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForAdministrativeExpense_019edb36-1044-761f-ba95-66718a29033d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e1d89-15c3-7438-9f29-90c65aa9436a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForAdministrativeExpense_019edb36-1044-761f-ba95-66718a29033d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/ScheduleHLine4iScheduleofAssetsHeldAtEndofYearDetails" xlink:type="simple" xlink:href="sbgi-20260625.xsd#ScheduleHLine4iScheduleofAssetsHeldAtEndofYearDetails"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/ScheduleHLine4iScheduleofAssetsHeldAtEndofYearDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e1d89-15c3-78bc-92d5-8a65e7a7b2c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e1d89-15c3-78bc-92d5-8a65e7a7b2c2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-7195-80ee-f179f25e8294" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e1d89-15c3-78bc-92d5-8a65e7a7b2c2" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-7195-80ee-f179f25e8294" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7195-80ee-f179f25e8294_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7195-80ee-f179f25e8294" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7195-80ee-f179f25e8294_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-775b-b15a-a76148843180" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7195-80ee-f179f25e8294" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-775b-b15a-a76148843180" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-7b66-8160-152b7efc272c" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-775b-b15a-a76148843180" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-7b66-8160-152b7efc272c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIdentifierAxis_019e1d89-15c3-7991-8eb3-713f478b02fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIdentifierAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e1d89-15c3-78bc-92d5-8a65e7a7b2c2" xlink:to="loc_us-gaap_InvestmentIdentifierAxis_019e1d89-15c3-7991-8eb3-713f478b02fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019e7563-79a2-7318-aaf8-ad0dad5eea16" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e1d89-15c3-78bc-92d5-8a65e7a7b2c2" xlink:to="loc_us-gaap_InvestmentTypeAxis_019e7563-79a2-7318-aaf8-ad0dad5eea16" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e7563-79a2-7318-aaf8-ad0dad5eea16_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e7563-79a2-7318-aaf8-ad0dad5eea16" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e7563-79a2-7318-aaf8-ad0dad5eea16_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e7563-79a2-76dd-aeed-28fabe439e36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e7563-79a2-7318-aaf8-ad0dad5eea16" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e7563-79a2-76dd-aeed-28fabe439e36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteedInvestmentContractMember_019e83ed-b581-78ed-b205-a43c2a263a06" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GuaranteedInvestmentContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e7563-79a2-76dd-aeed-28fabe439e36" xlink:to="loc_us-gaap_GuaranteedInvestmentContractMember_019e83ed-b581-78ed-b205-a43c2a263a06" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockFundMember_019e7563-a0af-7142-ad0b-3647462d7117" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e7563-79a2-76dd-aeed-28fabe439e36" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockFundMember_019e7563-a0af-7142-ad0b-3647462d7117" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019edb2f-efb6-7fd6-9c41-576b60ea75fb" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e1d89-15c3-78bc-92d5-8a65e7a7b2c2" xlink:to="loc_srt_RangeAxis_019edb2f-efb6-7fd6-9c41-576b60ea75fb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019edb2f-efb6-7fd6-9c41-576b60ea75fb_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019edb2f-efb6-7fd6-9c41-576b60ea75fb" xlink:to="loc_srt_RangeMember_019edb2f-efb6-7fd6-9c41-576b60ea75fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019edb2f-efb6-7995-9e8d-e49b7f804af2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019edb2f-efb6-7fd6-9c41-576b60ea75fb" xlink:to="loc_srt_RangeMember_019edb2f-efb6-7995-9e8d-e49b7f804af2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019edb30-140f-7c25-933b-24bfff60e3f8" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019edb2f-efb6-7995-9e8d-e49b7f804af2" xlink:to="loc_srt_MinimumMember_019edb30-140f-7c25-933b-24bfff60e3f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019edb30-3fd1-78ee-bba9-4f032fc2ac39" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019edb2f-efb6-7995-9e8d-e49b7f804af2" xlink:to="loc_srt_MaximumMember_019edb30-3fd1-78ee-bba9-4f032fc2ac39" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019e1d89-15c3-7abe-b3ca-440cff17bbcc" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_dei_EntityTaxIdentificationNumber_019e1d89-15c3-7abe-b3ca-440cff17bbcc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPlanNumber_019e1d89-15c3-7c0c-86b2-fca1bd394eb0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanPlanNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanPlanNumber_019e1d89-15c3-7c0c-86b2-fca1bd394eb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentInterestRate_019edb2a-0b2f-781e-ba60-24bc9da9d4fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentInterestRate_019edb2a-0b2f-781e-ba60-24bc9da9d4fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares_019e754e-4f69-7179-b72d-4ccc8c5e2165" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares_019e754e-4f69-7179-b72d-4ccc8c5e2165" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue_019e754f-ef23-78b4-a84c-0e23d8148b4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue_019e754f-ef23-78b4-a84c-0e23d8148b4e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate_019edb2f-78c0-7b7d-8a2d-7b9cc6e9d7f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate_019edb2f-78c0-7b7d-8a2d-7b9cc6e9d7f5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentParticipantLoanAfterDeemedDistribution_019e7562-e8cf-7cc1-a119-b40e7fbb68c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentParticipantLoanAfterDeemedDistribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentParticipantLoanAfterDeemedDistribution_019e7562-e8cf-7cc1-a119-b40e7fbb68c7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment_019e7563-dadd-7ae9-bfb3-2fa53d0f7a8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment_019e7563-dadd-7ae9-bfb3-2fa53d0f7a8c" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.sbgi.net/role/ScheduleHLine4iScheduleofAssetsHeldAtEndofYearDetails_1" xlink:type="simple" xlink:href="sbgi-20260625.xsd#ScheduleHLine4iScheduleofAssetsHeldAtEndofYearDetails_1"/>
  <link:definitionLink xlink:role="http://www.sbgi.net/role/ScheduleHLine4iScheduleofAssetsHeldAtEndofYearDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e1d89-15c3-78bc-92d5-8a65e7a7b2c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e1d89-15c3-78bc-92d5-8a65e7a7b2c2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e1d89-15c3-7195-80ee-f179f25e8294" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e1d89-15c3-78bc-92d5-8a65e7a7b2c2" xlink:to="loc_dei_LegalEntityAxis_019e1d89-15c3-7195-80ee-f179f25e8294" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-7195-80ee-f179f25e8294_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7195-80ee-f179f25e8294" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-7195-80ee-f179f25e8294_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e1d89-15c3-775b-b15a-a76148843180" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e1d89-15c3-7195-80ee-f179f25e8294" xlink:to="loc_dei_EntityDomain_019e1d89-15c3-775b-b15a-a76148843180" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_sbgi_EBP001Member_019e1d89-15c3-7b66-8160-152b7efc272c" xlink:href="sbgi-20260625.xsd#sbgi_EBP001Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e1d89-15c3-775b-b15a-a76148843180" xlink:to="loc_sbgi_EBP001Member_019e1d89-15c3-7b66-8160-152b7efc272c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019e7563-79a2-7318-aaf8-ad0dad5eea16" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e1d89-15c3-78bc-92d5-8a65e7a7b2c2" xlink:to="loc_us-gaap_InvestmentTypeAxis_019e7563-79a2-7318-aaf8-ad0dad5eea16" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e7563-79a2-7318-aaf8-ad0dad5eea16_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e7563-79a2-7318-aaf8-ad0dad5eea16" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e7563-79a2-7318-aaf8-ad0dad5eea16_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e7563-79a2-76dd-aeed-28fabe439e36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e7563-79a2-7318-aaf8-ad0dad5eea16" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e7563-79a2-76dd-aeed-28fabe439e36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteedInvestmentContractMember_019e83ed-b581-78ed-b205-a43c2a263a06" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GuaranteedInvestmentContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e7563-79a2-76dd-aeed-28fabe439e36" xlink:to="loc_us-gaap_GuaranteedInvestmentContractMember_019e83ed-b581-78ed-b205-a43c2a263a06" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockFundMember_019e7563-a0af-7142-ad0b-3647462d7117" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e7563-79a2-76dd-aeed-28fabe439e36" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockFundMember_019e7563-a0af-7142-ad0b-3647462d7117" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019edb2f-efb6-7fd6-9c41-576b60ea75fb" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e1d89-15c3-78bc-92d5-8a65e7a7b2c2" xlink:to="loc_srt_RangeAxis_019edb2f-efb6-7fd6-9c41-576b60ea75fb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019edb2f-efb6-7fd6-9c41-576b60ea75fb_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019edb2f-efb6-7fd6-9c41-576b60ea75fb" xlink:to="loc_srt_RangeMember_019edb2f-efb6-7fd6-9c41-576b60ea75fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019edb2f-efb6-7995-9e8d-e49b7f804af2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019edb2f-efb6-7fd6-9c41-576b60ea75fb" xlink:to="loc_srt_RangeMember_019edb2f-efb6-7995-9e8d-e49b7f804af2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019edb30-140f-7c25-933b-24bfff60e3f8" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019edb2f-efb6-7995-9e8d-e49b7f804af2" xlink:to="loc_srt_MinimumMember_019edb30-140f-7c25-933b-24bfff60e3f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019edb30-3fd1-78ee-bba9-4f032fc2ac39" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019edb2f-efb6-7995-9e8d-e49b7f804af2" xlink:to="loc_srt_MaximumMember_019edb30-3fd1-78ee-bba9-4f032fc2ac39" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019e1d89-15c3-7abe-b3ca-440cff17bbcc" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_dei_EntityTaxIdentificationNumber_019e1d89-15c3-7abe-b3ca-440cff17bbcc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPlanNumber_019e1d89-15c3-7c0c-86b2-fca1bd394eb0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanPlanNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanPlanNumber_019e1d89-15c3-7c0c-86b2-fca1bd394eb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentInterestRate_019edb2a-0b2f-781e-ba60-24bc9da9d4fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentInterestRate_019edb2a-0b2f-781e-ba60-24bc9da9d4fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares_019e754e-4f69-7179-b72d-4ccc8c5e2165" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares_019e754e-4f69-7179-b72d-4ccc8c5e2165" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue_019e754f-ef23-78b4-a84c-0e23d8148b4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue_019e754f-ef23-78b4-a84c-0e23d8148b4e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate_019edb2f-78c0-7b7d-8a2d-7b9cc6e9d7f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate_019edb2f-78c0-7b7d-8a2d-7b9cc6e9d7f5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentParticipantLoanAfterDeemedDistribution_019e7562-e8cf-7cc1-a119-b40e7fbb68c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentParticipantLoanAfterDeemedDistribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentParticipantLoanAfterDeemedDistribution_019e7562-e8cf-7cc1-a119-b40e7fbb68c7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment_019e7563-dadd-7ae9-bfb3-2fa53d0f7a8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e1d89-15c3-7a26-b755-9d658f5f3b12" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment_019e7563-dadd-7ae9-bfb3-2fa53d0f7a8c" xlink:type="arc" order="7"/>
  </link:definitionLink>
</link:linkbase>
