Omega Definition

ō-mĕgə, ō-mēgə, ō-mā-
noun
The twenty-fourth and final letter of the Greek alphabet (Ω, ω): in English transliteration, as in the etymologies of this dictionary, it is shown as ō
Webster's New World
The last (of any series); end.
Webster's New World
In cosmology theory, the ratio of the average density of matter in the universe to its critical density.
American Heritage
Omega is defined as the last of something, particularly the last letter in the Greek alphabet.
An example of the omega is the final day on earth.
YourDictionary
(physics) Angular velocity; symbol: ω.
Wiktionary
Synonyms:
  • z
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adjective
Relating to the end of the chain of carbon atoms that is opposite the carboxyl group in the molecule of a fatty acid.
American Heritage
other
An omega baryon.
American Heritage Science
An omega meson.
American Heritage Science
A model used to price derivatives that measures the effect of volatility. Also called vega, zeta, or kappa.
Webster's New World Finance

Other Word Forms of Omega

Noun

Singular:
omega
Plural:
omegala, omegas

Origin of Omega

  • Middle English from Greek ō mega large o (from its being a long vowel in Greek) ō the letter o mega neuter of megas large, great meg- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Middle English, from Ancient Greek (ō) μέγα (mega, “large") (omega is a long vowel in Ancient Greek).

    From Wiktionary

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