Whitsunday

[ hwit-suhn-dey, -dee, wit-; hwit-suh n-dey, wit- ]
/ ˈʰwɪtˈsʌn deɪ, -di, ˈwɪt-; ˈʰwɪt sənˌdeɪ, ˈwɪt- /

noun

the seventh Sunday after Easter, celebrated as a festival in commemoration of the descent of the Holy Spirit on the day of Pentecost.

Origin of Whitsunday

before 1100; Middle English whitsonenday, Old English Hwīta Sunnandæg white Sunday; probably so called because the newly baptized wore white robes on that day
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for whitsunday

Whitsunday

/ (ˌhwɪtˈsʌndɪ, ˌwɪt-) /

noun

(in Scotland) May 15, one of the four quarter days
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012