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• n  an influence that works subtly to lighten or modify something
  his sermons benefited from a leavening of humor
• n  a substance used to produce fermentation in dough or a liquid
• v  cause to puff up with a leaven

• An Ultra-Orthodox Jewish man prays as he burns food containing leavening in the Mea Shearim neighborhood of Jerusalem prior to the start of the Passover holiday.
• Precise, sure, but her loveless life still needs a bit of leavening.
• The agents of fermentation, of leavening, of caramelizing are no longer mysteries.

• leaven
• raise
• prove

News & Articles

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• Chill Out At Reggae In The Desert Music Fest
  It's the musical equivalent of a cool breeze leavening the June heat. With the return of Reggae in the Desert, it's time to chill out and enjoy some mood enhancement that doesn't require a prescription. The annual festival is the antidote to road rage,
  June 13, 2013 - Las Vegas Review-Journal

Quotes

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• Pope Benedict XVI in Zenit News Agency
  Benedict XVI concluded by expressing the hope that the forthcoming beatification of Father José Olallo Valdés "may give fresh impulse to your service to the Church and the people of Cuba, always being a leavening for reconciliation, justice and...
• Barack Obama in Newsweek
  The danger of too much government is matched by the perils of too little,said Obama. "That without the leavening hand of wise policy, markets can crash, monopolies can stifle competition, the vulnerable can be exploited. And [our...
• Colleen Patrick-Goudreau in Springfield State Journal Register
  People associate baking with eggs, butter and cow's milk, but it's more accurate to say baked goods need fat, moisture and leavening,says Colleen Patrick-Goudreau, author of "The Joy of Vegan Baking."