Strong's #4005: pentekoste (pronounced pen-tay-kos-tay')

feminine of the ordinal of 4004; fiftieth (2250 being implied) from Passover, i.e. the festival of "Pentecost":--Pentecost.

Thayer's Greek Lexicon:

́

pentēkostē

Pentecost = "the fiftieth day"

1) the second of the three great Jewish feasts, celebrated at Jerusalem yearly, the seventh week after the Passover, in grateful recognition of the completed harvest

Part of Speech: noun feminine

Relation: feminine of the ord. of G4004

Citing in TDNT: 6:44, 826

Usage:

This word is used 3 times:

 

Acts 2:1: "And when the day of Pentecost was fully come, they were all with one accord"
Acts 20:16: "Jerusalem the day of Pentecost."
1 Corinthians 16:8: "at Ephesus until Pentecost."