Webster's English Dictionary

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pentecost

Pen.te.cost \'pent-i-.ko.st, -.ka:st\ n [ME, fr. OE pentecosten, fr. LL 
   pentecoste, fr. Gk pente-kost]e-, lit., fiftieth day, fr. pente-kostos 
   fiftieth, fr. pente-konta fifty, fr. penta- + -konta (akin to L viginti 
   twenty) - more at VIGESIMAL 1: SHABUOTH  2: a Christian feast on the 7th 
   Sunday after Easter commemorating the desce nt of the Holy Spirit on the 
   apostles