Webster's Revised Unabridged Dictionary · 1913

omega

omega (ō*mē"gȧ or ō*mā"gȧ or ō"me*gȧ; 277) , noun

[New Latin, from Greek 'w^ me`ga, that is, the great or long o. Compare Mickle.]

1.
The last letter of the Greek alphabet. See Alpha.
2.
The last; the end; hence, death.
Omega! thou art Lord,” they said. — Tennyson
The alpha and omega of science. — Sir J. Herschel
Collocations (1)
Alpha and Omega , the beginning and the ending; hence, the chief, the whole. — Rev. i. 8