Pentecost
noun
Pen·te·cost ˈpen-ti-ˌkȯst 
-ˌkäst
1
: shavuot
2
: a Christian feast on the seventh Sunday after Easter commemorating the descent of the Holy Spirit on the apostles
called also Whitsunday
Word History
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
First Known Use
before the 12th century, in the meaning defined at sense 1
Geographical Definition
Pentecost
geographical name
Pen·te·cost ˈpen-ti-ˌkȯst
-ˈkäst
island of Vanuatu in the southwestern Pacific population 31,500