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English definition of “leaven”

leaven

verb [T] uk   /ˈlev.ən/ us  
to add a substance to bread or another food made with flour to make it get bigger when it is cookedPreparing foodPreparing food using heat formal to make something less boring: Even a speech on a serious subject should be leavened with a little humour.Making things betterBecoming better
(Definition of leaven from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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