definition of
fermentation

[1] #1 fermentation n. [agitation, ferment, tempestuousness, unrest] a state of agitation or turbulent change or development; "the political ferment produced new leadership"; "social unrest". wn

[2] #2 fermentation n. [zymosis, zymolysis, fermenting, ferment] a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol. wn