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English to English noun
| 1 |
an influence that works subtly to lighten or modify something |  | Example: his sermons benefited from a leavening of humor
source: wordnet30
| 2 |
a substance used to produce fermentation in dough or a liquid | | source: wordnet30
| 3 |
The act of making light, or causing to ferment, by means of leaven. | | source: webster1913
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