whitsunday Meaning, Definition & Usage

  1. noun seventh Sunday after Easter; commemorates the emanation of the Holy Spirit to the Apostles; a quarter day in Scotland
    Pentecost.

WordNet

Whit"sun*day noun
Etymology
White + Sunday.
Definitions
  1. (Eccl.) 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.
  2. (Scots Law) See the Note under Term, n., 12.

Webster 1913