Definition of "Ferment" :

noun: a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol

noun: a state of agitation or turbulent change or development

"The political ferment produced new leadership."

noun: a substance capable of bringing about fermentation

verb: go sour or spoil

verb: cause to undergo fermentation

"We ferment the grapes for a very long time to achieve high alcohol content."

verb: work up into agitation or excitement

"This religion is fermenting Africa."

verb: be in an agitated or excited state

"The Middle East is fermenting."