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April Fool's Day

noun [C or U]
 
 
/ˌeɪ.prəlˈfuːlzˌdeɪ/ (UK also All Fools' Day)

Definition

1 April, a day when people play tricks on peopleCelebrations, parties and special occasionsSpecific holidays and festivals
(Definition of April Fool's Day noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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