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Definition of ferment verb from the Oxford Advanced American Dictionary

     

    ferment

     verb
    verb
    NAmE//fərˈmɛnt//
     
    [intransitive, transitive]Verb Forms present simple I / you / we / they ferment
     
    he / she / it ferments
     
    past simple fermented
     
    -ing form fermenting
     
     
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  1. 1to experience a chemical change because of the action of yeast or bacteria, often changing sugar to alcohol; to make something change in this way Fruit juices ferment if they are kept for too long.
  2. 2(figurative) A blend of emotions fermented inside her. ferment something Red wine is fermented at a higher temperature than white.
  3. fermentation
     
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  4. NAmE//ˌfərmɛnˈteɪʃn//
     
    , NAmE//ˌfərmənˈteɪʃn//
     
    noun [uncountable] Sugar is converted into alcohol by a process of fermentation.
See the Oxford Advanced Learner's Dictionary entry: ferment

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