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 (ō-mĕg′ə, ō-mē′gə, ō-mā′-)
1. The 24th letter of the Greek alphabet. See Table at alphabet.
2. The last of a series; the end.
3. In cosmology theory, the ratio of the average density of matter in the universe to its critical density.
adj. Chemistry
Relating to the end of the chain of carbon atoms that is opposite the carboxyl group in the molecule of a fatty acid.

[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; see meg- in Indo-European roots.]


1. (Letters of the Alphabet (Foreign)) 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]


(oʊˈmi gə, oʊˈmeɪ-, oʊˈmɛg ə)

n., pl. -gas.
1. the 24th and last letter of the Greek alphabet (Ω, ω).
2. the last of any series; the end.
[< Greek ō méga literally, big o. compare omicron]
ThesaurusAntonymsRelated WordsSynonymsLegend: - the ending of a series or sequenceomega - the ending of a series or sequence; "the Alpha and the Omega, the first and the last, the beginning and the end"--Revelation
conclusion, ending, finish - event whose occurrence ends something; "his death marked the ending of an era"; "when these final episodes are broadcast it will be the finish of the show" - the last (24th) letter of the Greek alphabet
Greek alphabet - the alphabet used by ancient Greeks
alphabetic character, letter of the alphabet, letter - the conventional characters of the alphabet used to represent speech; "his grandmother taught him his letters"


[ˈəʊmɪgə] Nomega f


nOmega nt