All Fools' Day
The Oxford Pocket Dictionary of Current English
All Fools' Day n. ...
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April Fool's Day
The Columbia Encyclopedia, Sixth Edition
April Fool's Day or All Fool's Day, holiday of uncertain origin, known for practical joking and celebrated on the first of April. Prior to the adoption of the Gregorian calendar in 1564, the date was observed as New Year's Day by ...
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