“Pentecost” literally means 50th. For the Jews it is a feast celebrated on the 50th day after the Passover feast and for us, Christians, it is a feast celebrated on the 50th day after Jesus’ Resurrection.
The event: On the day of Pentecost 1) The Holy Spirit descended upon the apostles and the Blessed Virgin in fiery tongues. 2) The frightened apostles were transformed into fearless and zealous preachers and evangelizers. 3) The audience heard Peter speak in their own respective languages (Gift of Tongues). 4) The early Christians became powerful witnesses and brave martyrs for their faith in Jesus.