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Definition of leaven


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leav·en  audio  (lvn) KEY  

NOUN:
  1. An agent, such as yeast, that causes batter or dough to rise, especially by fermentation.
  2. An element, influence, or agent that works subtly to lighten, enliven, or modify a whole.
TRANSITIVE VERB:
leav·ened , leav·en·ing , leav·ens
  1. To add a rising agent to.
  2. To cause to rise, especially by fermentation.
  3. To pervade with a lightening, enlivening, or modifying influence.

ETYMOLOGY:
Middle English, from Old French levain, from Vulgar Latin *levmen, from Latin levre, to raise; see legwh- in Indo-European roots


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The American Heritage® Dictionary of the English Language, Fourth Edition.
Copyright © 2000 by Houghton Mifflin Company.
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