Definitions from Wiktionary ( )

▸ noun:  Any agent used to make dough rise or to have a similar effect on baked goods.
▸ noun:  (figurative) Anything that induces change, especially a corrupting or vitiating change.
▸ verb:  (transitive) To add a leavening agent.
▸ verb:  (transitive) To cause to rise by fermentation.
▸ verb:  (transitive, figuratively) To temper an action or decision.
▸ verb:  (transitive, figuratively) To imbue; to infect; to vitiate.
▸ verb:  To rise or become larger; to prove.

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