leaven

1. (noun) an influence that works subtly to lighten or modify something; "his sermons benefited from a leavening of humor"
Synonyms: leavening
Related Words: imponderable

2. (noun) a substance used to produce fermentation in dough or a liquid
Synonyms: leavening
Related Words: baking powder, barm, matter, sourdough, substance, yeast

3. (verb) cause to puff up with a leaven; of dough; "unleavened bread"
Synonyms: prove, raise
Related Words: bring up, elevate, get up, lift, raise



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