Question: What does the Bible mean by "Pentecost"? 1. The word derives from the Greek for "the fiftieth day." It was the Jewish Feast of Weeks (Ex.34:22; Deut.16:9-11) also called the feast of Harvest (Ex.23:16) or the Day of First-Fruits (Num.28:26). 2. It was the second of the three great annual feasts on which all the males were required to assemble at the tabernacle/temple. The first was Passover, the second was Pentecost, the third was the Feast of Tabernacles. The second was came to be called Pentecost, because it was observed 50 days after Passover (Lev.23:15,16). Pentecost always fell on Sunday, the first day of the week, because they would number 7 complete weeks, making 49 days, ending on a sabbath, and then that next day, Sunday, would be Pentecost. 3. You will recall that Jesus was crucified during the Feast of Passover. The special significance for us attached to the Pentecost after Jesus' crucifixion (recorded in Acts 2), is that He sent forth the Holy Spirit upon the apostles, to guide them into all the truth, and gave them power to confirm the word with miracles. On that Pentecost, Jesus was proclaimed to be both Lord and Christ, and the Gospel plan of salvation, with conditions of forgiveness was preached.On that day, the kingdom came with power. On that day the church was established.