Answer: fermentation

AnswerCrossword Clue
fermentationAgitation; excitement
fermentationa chemical change with effervescence, as by the action of yeast
fermentationThe chemical breakdown of a substance by bacteria, yeasts, or other microorganisms, typically involving effervescence and the giving off of heat
fermentationThe process of this kind involved in the making of beer, wine, and liquor, in which sugars are converted to ethyl alcohol