Whitsunday, n. [White + Sunday.].
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The seventh Sunday, and the fiftieth day, after Easter; a festival of the church in commemoration of the descent of the Holy Spirit on the day of Pentecost; Pentecost; -- so called, it is said, because, in the primitive church, those who had been newly baptized appeared at church between Easter and Pentecost in white garments. [1913 Webster]
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See the Note under
Term,
n., 12. [
1913 Webster]