What is the meaning of Ferment?

To react, using fermentation; especially to produce alcohol by aging or by allowing yeast to act on sugars; to brew.

To stir up, agitate, cause unrest or excitement in.

Something, such as a yeast or barm, that causes fermentation.

A state of agitation or of turbulent change.

A gentle internal motion of the constituent parts of a fluid; fermentation.

A catalyst.

third-person plural present indicative/subjunctive of fermer

ferment, unrest

enzyme

ferment

Source: wiktionary.org