/ ˈpentɪkɒst; NAmE -kɔːst; -kɑːst/ noun [ U , C ]
1.
( BrE also ˌWhit ˈSunday ) (in the Christian Church) the 7th Sunday after Easter when Christians celebrate the Holy Spirit coming to the Apostles
2.
= Shavuoth
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WORD ORIGIN
Old English pentecosten , via ecclesiastical Latin from Greek pentēkostē (hēmera) fiftieth (day) (because the Jewish festival is held on the fiftieth day after the second day of Passover).