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leavening

leav·en·ing

leavening

 
pronunciation:
le v nIng
part of speech: noun
definition 1: an agent such as yeast or baking powder that causes the formation of carbon dioxide gas in batter or dough, causing it to expand and rise.
definition 2: an influential addition that enlivens something or causes something to slowly change.
His sense of humor is the leavening in this dreary office.