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Definition of leaven noun from the Oxford Advanced American Dictionary

     

    leaven

     noun
    noun
    NAmE//ˈlɛvn//
     
    (also leavening
     
    )
    [uncountable]
     
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  1. 1a substance, especially yeast, that is added to bread before it is cooked to make it rise
  2. 2(figurative) A few jokes add leavening to a boring speech.
See the Oxford Advanced Learner's Dictionary entry: leaven

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