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Greek alphabet
Other letters

Omega (uppercase/lowercase Ω ω) is the 24th and the last letter of the Greek alphabet. It stood for a long 'o' sound in Ancient Greek. It still stands for 'o' in Modern Greek, but there is no longer a difference between long and short vowels, so it sounds the same as Omicron. In the system of Greek numerals, it stands for the number 800.


There was also once a letter 'Omega' Ѡ in the Cyrillic alphabet. It was there so people could spell Greek names both in Cyrillic and in Greek in the same way. However, this letter is no longer used today.

In mathematics, the uppercase omega Ω is used in big-Omega notation (a variant of big-O notation). It is also used to represent the Omega constant.[1] In electromagnetism and engineering, the uppercase Ω is used as the symbol for ohms,[2] which are the units of electrical resistance. In physics and other sciences, the lowercase ω is often used to represent angular frequency.

In modern English, the phrase 'From alpha to omega' expresses the idea of 'everything'.

Related pages


  1. 'Greek/Hebrew/Latin-based Symbols in Mathematics'. Math Vault. 2020-03-20. Retrieved 2020-10-07.
  2. 'Omega Symbol in Greek Alphabet Ohm Symbol'. Retrieved 2020-10-07.

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Related to omega: Omega 3, Omega 6


(ō-mĕg′ə, ō-mē′gə, ō-mā′-)n.
1. The 24th letter of the Greek alphabet. See Table at alphabet.
Omega mart
3. In cosmology theory, the ratio of the average density of matter in the universe to its critical density.
5. See omega meson.
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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈəʊmɪɡə) n
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
[C16: from Greek ō mega big o; see mega-, omicron]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(oʊˈmi gə, oʊˈmeɪ-, oʊˈmɛg ə)
n., pl. -gas.
1. the 24th and last letter of the Greek alphabet (Ω, ω).
[< Greek ō méga literally, big o. compare omicron]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved. - 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'
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005


Omega Electronics

Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007

Omega Symbol

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