Pentecost - Vine's Expository Dictionary of New Testament Words
Pentecost
[ 1,,G4005, pentekostos ]an adjective denoting fifieth," is used as a noun, with "day" understood, i.e., the "fifieth" day after the Passover, counting from the second day of the Feast, Acts 2:1; Acts 20:16; 1 Corinthians 16:8. For the Divine instructions of Israel See Exodus 23:16; Exodus 34:22; Leviticus 23:15-Leviticus 23:21; Numbers 28:26-Numbers 28:31; Deuteronomy 16:9-Deuteronomy 16:11.