Definition of "Whitsuntide"

The third year he had a tailor staying with him before Whitsuntide, making new clothes for the holidays.

1886, Peter Christen Asbjørnsen, translated by H.L. Brækstad, Folk and Fairy Tales, page 158

There are eight 4-wheel coaches of the open toastrack type, but provided with roofs, and during the holiday season, usually beginning at Whitsuntide, trains are run as required on the one-engine-in-steam principle.

1941 July, “The Isle of Man Railways”, in Railway Magazine, page 315