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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. 2 sustenance (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