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omega

[oh-mee-guh, oh-mey-, oh-meg-uh]
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noun
  1. the 24th and last letter of the Greek alphabet (Ω, ω).
  2. the vowel sound represented by this letter.
  3. the last of any series; the end.
  4. omega baryon.
  5. omega meson.
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Origin of omega

< Greek ō méga literally, great o. Cf. omicron
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for omega

omega

noun
  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
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Word Origin

C16: from Greek ō mega big o; see mega-, omicron
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for omega

c.1400, from Medieval Greek omega, from classical Greek o mega "big 'o' " (in contrast to o micron "little 'o' "); so called because the vowel was long in ancient Greek. From mega (see mega-). The final letter of the Greek alphabet, hence used figuratively for "the last, final" of anything (cf. Rev. i:8),

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Online Etymology Dictionary, © 2010 Douglas Harper

omega in Medicine

omega

(ō-mĕgə, ō-mēgə, ō-mā-)
n.
  1. The 24th letter of the Greek alphabet.
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adj.
  1. Of or characterizing a chemical group or position at the end of a molecular chain, such as omega-oxidation.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

omega in Science

omega

[ō-mĕgə, ō-mēgə, ō-mā-]
  1. An omega baryon.
  2. An omega meson.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Idioms and Phrases with omega

omega

see alpha and omega.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.