American Dictionary

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Definition leaven in American English

leaven noun

[uncountable] noun
/ˈlev(ə)n/
/ˈlev(ə)nɪŋ/
1

a substance such as yeast that is added to a bread mixture so that it will contain air and will be bigger and lighter

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2

something that makes a situation, story, movie, etc. more interesting, funny, or exciting

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Definition leaven in American English