pentecost

(noun) seventh Sunday after Easter; commemorates the emanation of the Holy Spirit to the Apostles; a quarter day in Scotland. Synonyms: Pentecost, Whitsunday.

(noun) (Judaism) Jewish holy day celebrated on the sixth of Sivan to celebrate Moses receiving the Ten Commandments. Synonyms: Shavous, Shabuoth, Shavuoth, Shavuot, Pentecost, Feast of Weeks.