fermentation

noun2

1. •
   Any of many anaerobic biochemical reactions in which an enzyme (or several enzymes produced by a microorganism) catalyses the conversion of one substance into another; especially the conversion (using yeast) of sugars to alcohol or acetic acid with the evolution of carbon dioxide
2. •
   A state of agitation or excitement; a ferment.

   • [T]he Grace that is then given to us is like a piece of Leven put into a lump of dough, and Faith and Repentance do in all the periods of our life put it into fermentation and activity. — 1678