Main Entry: Pen·te·cost

Pronunciation: \ˈpen-ti-ˌkȯst, -ˌkäst\

Function: noun

Etymology: Middle English, from Old English pentecosten, from Late Latin pentecoste, from Greek pentēkostē, literally, fiftieth day, from pentēkostos fiftieth, from pentēkonta fifty, from penta- + -konta (akin to Latin viginti twenty) — more at vigesimal

Date: before 12th century

1 : shabuoth
2 : a Christian feast on the seventh Sunday after Easter commemorating the descent of the Holy Spirit on the apostles —called also Whitsunday