leavening
1. [ noun ] an influence that works subtly to lighten or modify something
Synonyms: leaven
Examples:

"his sermons benefited from a leavening of humor"

Related terms: imponderable
2. [ noun ] a substance used to produce fermentation in dough or a liquid
Synonyms: leaven
Related terms: substance sourdough baking_powder yeast raise
Similar spelling:   Lebanon