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Alpha and Omega
ALPHA AND OMEGA ăl’ fə, ō mĕg ə (Α καἱ Ω).
The first and last letters of the Greek alphabet, alpha being equivalent to our letter a and omega (literally, great O) to our long o as in no. The first and last letters of the Hebrew alphabet are א and ת and these were used by the ancient Jews to mean “from first to last” or “from beginning to end,” as one might say, “from A to Z.” This Jewish usage probably explains the similar usage of alpha and omega in the New Testament.
Usage in the New Testament
“” in Dictionnaire d’archéologie chrétienne et de liturgie (1903); SHERK, I (1907), 136, 137; HDB (1923), I, 70; W. J. McKnight, The Apocalypse of Jesus Christ: John to the (1927), 19, 20, 47, 48; ISBE (1929), I, 103; Encyclopedia of Christianity (1964), I, 151, 152.