English to English

leaven

('l/E/v/@/n )

a substance used to produce fermentation in dough or a liquid(noun.substance)

Synonym:
leavening

source: wordnet30
an influence that works subtly to lighten or modify something(noun.cognition)

Example:
His sermons benefited from a leavening of humor.

source: wordnet30
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.(noun)

source: webster1913

cause to puff up with a leaven(verb.motion)

Example:
Unleavened bread.

Synonym:
prove, raise

source: wordnet30
To make light by the action of leaven; to cause to ferment.(verb)

source: webster1913

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