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Meaning Of Leaven
n.
Any substance that produces, or is designed to produce,
fermentation, as in dough or liquids; esp., a portion of fermenting
dough, which, mixed with a larger quantity of dough, produces a general
change in the mass, and renders it light; yeast; barm.
n.
Anything which makes a general assimilating (especially a
corrupting) change in the mass.
v. t.
To make light by the action of leaven; to cause to
ferment.