Definition of ferment

• n. - That which causes fermentation, as yeast, barm, or fermenting beer.
• n. - Intestine motion; heat; tumult; agitation.
• n. - A gentle internal motion of the constituent parts of a fluid; fermentation.
• n. - To cause ferment of fermentation in; to set in motion; to excite internal emotion in; to heat.
• v. i. - To undergo fermentation; to be in motion, or to be excited into sensible internal motion, as the constituent oarticles of an animal or vegetable fluid; to work; to effervesce.
• v. i. - To be agitated or excited by violent emotions.