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Definition of fermentation noun from the Oxford Advanced Learner's Dictionary

 

fermentation

 noun
noun
BrE BrE//ˌfɜːmenˈteɪʃn//
 
; NAmE NAmE//ˌfɜːrmenˈteɪʃn//
 
[uncountable]
 
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the process of chemical change caused by the action of yeast or bacteria, often changing sugar to alcohol Sugar is converted into alcohol by a process of fermentation.