Webster's English Dictionary

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ferment

1. fer.ment \(.)f*r-'ment\ \-'ment-*-b*l\ vi 1: to undergo fermentation  2: 
   to be in a state of agitation or intense activity  1: to cause to undergo 
   fermentation  2: to work up (as into a state of agitation) : FOMENT  - 
   fer.ment.able aj
2. fer.ment \'f*r-.ment also (.)f*r-'ment\ n [ME, fr. L fermentum yeast] 1: 
   an agent capable of bringing about fermentation  2a: FERMENTATION  2b: a 
   state of unrest : AGITATION