Pen ‧ te ‧ cost /ˈpentɪkɒst $ -kɒːst, -kɑːst/ BrE AmE noun [uncountable and countable]
[ Date: 1000-1100 ; Language: Late Latin ; Origin: pentecoste , from Greek , 'fiftieth day' , from pentekostos 'fiftieth' ]
1 . ( also Whitsun British English ) the seventh Sunday after Easter, when Christians celebrate the appearance of the Holy Spirit to the ↑ apostle s
2 . a Jewish religious holiday 50 days after Passover