Noun whitsun has 1 sense
  1. Whitsun, Whitsuntide, Whitweek - Christian holiday; the week beginning on Whitsunday (especially the first 3 days)
    --1 is a kind of season
    --1 is a part of church calendar, ecclesiastical calendar
    --1 has parts:
     Pentecost, Whitsunday; Whitmonday, Whitsun Monday; Whit-Tuesday, Whitsun Tuesday
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