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Definition of sustenance noun from the Oxford Advanced American Dictionary

      

    sustenance

     noun
    noun
    NAmE//ˈsʌstənəns//
     
    [uncountable] (formal)
     
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  1. 1the food and drink that people, animals, and plants need to live and stay healthy There's not much sustenance in a bowl of soup. (figurative) Arguing would only give further sustenance to his allegations.
  2. 2sustenance (of something) the process of making something continue to exist Free and fair elections are essential for the sustenance of a democratic society.
See the Oxford Advanced Learner's Dictionary entry: sustenance