Etymology
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Whitsun

late 13c., contraction of Whitsunday.

updated on October 14, 2010

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Definitions of Whitsun from WordNet

Whitsun (n.)
Christian holiday; the week beginning on Whitsunday (especially the first 3 days);
Synonyms: Whitsuntide / Whitweek
From wordnet.princeton.edu, not affiliated with etymonline.