The New Dictionary of Cultural Literacy, Third Edition. 2002.
alpha and omega
(AL-fuh; oh-MAY-guh, oh-MEG-uh, oh-MEE-guh) The beginning and the end. In the Greek alphabet, in which the New Testament was written, alpha is the first letter and omega is the last. In the Book of Revelation, God says, I am Alpha and Omega, the first and the last, meaning that God remains from the beginning to the end of time.