Etymology
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Whitsunday

"Pentecost," late Old English Hwita Sunnandæg "white Sunday" (see white (adj.)); possibly so called from the white baptismal robes worn by newly baptized Christians on this day. Related: Whitsuntide.

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Definitions of Whitsunday

Whitsunday (n.)
seventh Sunday after Easter; commemorates the emanation of the Holy Spirit to the Apostles; a quarter day in Scotland;
Synonyms: Pentecost
From wordnet.princeton.edu