omega
Americannoun
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omegas
plural
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the 24th and last letter of the Greek alphabet (Ω, ω).
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the vowel sound represented by this letter.
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the last of any series; the end.
noun
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the 24th and last letter of the Greek alphabet (Ω, ω), a long vowel, transliterated as o or ō
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the ending or last of a series
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An omega baryon.
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An omega meson.
Other Word Forms
Noun Inflected Forms
Etymology
Origin of omega
< Greek ō méga literally, great o. Cf. omicron
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
A heatwave in late May across Europe was tied to a heat dome, while a horseshoe-shaped omega pattern was identified as a key driver of a major hot spell over France in June 2025.
From Barron's ● Jun. 23, 2026
They all bear a special omega mark above Lincoln’s shoulder.
From The Wall Street Journal ● Nov. 12, 2025
The decision says almost nothing about the procedure that most laypersons think is the alpha and omega of IVF — the implantation of manually fertilized embryos into the uterus.
From Los Angeles Times ● Jun. 5, 2024
A higher omega 3:6 ratio was linked to a 26% reduced risk of depression.
From Salon ● Feb. 21, 2024
This was the alpha and omega of our existence, and went unquestioned.
From "Long Walk to Freedom" by Nelson Mandela
Literally full of sigmas, phis, omegas and other symbols.
From Washington Times ● Apr. 7, 2020
"There are ups and downs in life. Alphas and omegas," he said.
From Los Angeles Times ● Mar. 14, 2015
For omegas on the go, she tosses a few Coromega Omega3 Squeeze packets into her Kelly bag.
From New York Times ● Feb. 22, 2011
"The demand we have for packs and dens and omegas is almost more than we can handle right now," says Liz Haesler, vice president of home life and trend at Best Buy.
From Time ● Nov. 11, 2010
It turns out that corn-fed cows don’t have the healthy balance of omegas.
From "The Omnivore's Dilemma" by Michael Pollan
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
