leaven - definition and synonyms

noun [uncountable] 

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/ˈlev(ə)n/

or leavening 

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/ˈlev(ə)nɪŋ/

  1. 1
    literary something that makes a situation, story, film etc more interesting, funny, or exciting
  2. 2
    a substance such as yeast that is added to a bread mixture so that it will contain air and will be bigger and lighter