omega (ˈəʊmɪɡə)

—n
1.	the 24th and last letter of the Greek alphabet (Ω, ω), a long vowel, transliterated as o or ō
2.	the ending or last of a series

[C16: from Greek ō mega big o; see mega-, omicron]

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Etymonline

Word Origin & History

omega

c.1400, from Medieval Gk. omega, final letter of the Gk. alphabet (cf. Rev. i.8), from classical Gk. o mega "big 'o' " (in contrast to o micron "little 'o' "); so called because the vowel was long in ancient Gk.

Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage

Medical Dictionary

omega o·me·ga (ō-měg'ə, ō-mē'gə, ō-mā'-)
n.

Symbol ω, Ω The 24th letter of the Greek alphabet. adj.
Of or characterizing a chemical group or position at the end of a molecular chain, such as omega-oxidation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage

Science Dictionary

omega (ō-měg'ə, ō-mē'gə, ō-mā'-) Pronunciation Key

An omega baryon.
An omega meson.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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FOLDOC

Computing Dictionary

Omega definition

1. A prototype-based object-oriented language from Austria.
["Type-Safe Object-Oriented Programming with Prototypes - The Concept of Omega", G. Blaschek, Structured Programming 12:217-225, 1991].
2. A successor to TeX extended to handle the Unicode character set.
(http://ens.fr/omega/).
(1997-11-20)

Easton

Bible Dictionary