Simple past tense and past participle of leaven.(verb)
Prepared using leavening(adjective)
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Use "leavened" in a sentence
"The outcome of it all is, the one million communicants and the six millions more or less "leavened" by Christian principle and sentiment."
"But in Israel, stores and factories own millions of dollars worth of bread and other so-called "leavened" foods."
"The tragic absurdity in his films is usually leavened by humor -- but in this one I tried to fight against my sense of humor, the film is very austere."