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Noun: leaven  le-vun
  1. A substance used to produce fermentation in dough or a liquid
    - leavening
     
  2. An influence that works subtly to lighten or modify something
    - leavening
Verb: leaven  le-vun
  1. Cause to puff up with a leaven
    - raise, prove

Derived forms: leavened, leavening, leavens

Type of: bring up, elevate, get up, imponderable, lift, raise, substance

Encyclopedia: Leaven