Strong's G4005 — πεντηκοστή (noun)
pentekoste (pen-tay-kos-tay') n.
1. fiftieth day from Passover, i.e. the festival of "Pentecost"
{G2250 being implied}
[feminine of the ordinal of G4004]
KJV: Pentecost 
Root(s): G4004 
See also: G2250 
Hebrew root: πεντήκοντα
Occurrences: 3