Definition of Whitsun noun from the Oxford Advanced Learner's Dictionary

 

Whitsun

 noun
noun
BrE BrE//ˈwɪtsn//
 
; NAmE NAmE//ˈwɪtsn//
 
[uncountable, countable]
 
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the 7th Sunday after Easter and the days close to it Word Origin Middle English: from Whit Sunday, reduced as if from Whitsun Day.
See the Oxford Advanced American Dictionary entry: Whitsun