fermentation
US /ˌfɝː.menˈteɪ.ʃən/
UK /ˌfɝː.menˈteɪ.ʃən/
1.
the chemical breakdown of a substance by bacteria, yeasts, or other microorganisms, typically involving effervescence and the giving off of heat.
:
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Yeast is essential for the fermentation of grapes into wine.
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The process of fermentation produces alcohol and carbon dioxide.