I. ˈpen-ti-ˌkȯst, -ˌkäst 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 vi ginti 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
II. ˈpen-ti-ˌkȯst, -ˈkäst geographical name
island SW Pacific in Vanuatu population 11,336