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English definition of “April Fool's Day”

April Fool's Day

noun [C or U] uk   /ˌeɪ.prəlˈfuːlzˌdeɪ/ (UK also All Fools' Day) us  
1 April, a day when people play tricks on peopleCelebrations, parties and special occasionsSpecific holidays and festivals
(Definition of April Fool's Day from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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