1. The seventh Sunday after Easter, commemorating the descent of the Holy Spirit upon the disciples. Also called Whitsunday. 2.Judaism See Shavuot.
ETYMOLOGY:
Middle English pentecoste, from Old English Pentecosten, from Late Latin Pentcost, from Greek pentkost (hmer), fiftieth (day), feminine of pentkostos, fiftieth, from pentkonta, fifty. See penkwe in Appendix I.