01 n. The week commencing with Whitsunday, esp. the first three days -- Whitsunday, Whitsun Monday, and Whitsun Tuesday; the time of Pentecost.
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1.
The week commencing with Whitsunday, esp. the first three days -- Whitsunday, Whitsun Monday, and Whitsun Tuesday; the time of Pentecost.