"I am the alpha and the omega!" This appellation of Jesus from the Book of Revelation perhaps explains the meaning of eternity. The word eternity, which stretches its import to eternal existence or something that is not bound by time, stands for something that is endless. God is usually referred to as eternity for He exists out of time and space. He is eternally existent. For a better idea on eternity, check out the famous alpha and omega quotations and sayings and enlighten yourself on this.