Leaven Definition
lĕvən
leavened, leavening, leavens
noun
leavens
A small piece of fermenting dough put aside to be used for producing fermentation in a fresh batch of dough.
Webster's New World
An element, influence, or agent that works subtly to lighten, enliven, or modify a whole.
American Heritage
Webster's New World
Webster's New World
(figuratively) Anything that makes a general assimilating (especially a corrupting) change in the mass.
Wiktionary
verb
leavened, leavening, leavens
To add a rising agent to.
American Heritage
To make (batter or dough) rise before or during baking by means of a leavening agent.
Webster's New World
To cause to rise, especially by fermentation.
American Heritage
To spread through, causing a gradual change.
Webster's New World
To pervade with a lightening, enlivening, or modifying influence.
American Heritage
Origin of Leaven
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Middle English from Old French levain from Vulgar Latin levāmen from Latin levāre to raise legwh- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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Middle English levain, from Old French, from Late Latin levamen, instead of levamentum, ultimately from Latin levō (“I raise").
From Wiktionary
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