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Synonyms

omega

American  
[oh-meg-uh, oh-mee-guh, oh-mey-] / oʊˈmɛg ə, oʊˈmi gə, oʊˈmeɪ- /

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.

omega British  
/ ˈəʊmɪɡə /

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

"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
omega Scientific  
/ ō-mĕg′ə,ō-mē′gə,ō-mā′- /

  1. An omega baryon.

  2. An omega meson.

omega Idioms  

  1. see alpha and omega.

Etymology

Origin of omega

< Greek ō méga literally, great o. 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.

Over the course of six weeks, healthy adults who took the synbiotic experienced the greatest reduction in inflammation related proteins compared with those who took omega 3 or fiber by itself.

From Science Daily • Feb. 11, 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

My good fortune, the fortune that saved my life, was that he was not only a young adult but a pliable young adult, an omega animal.

From "Life of Pi" by Yann Martel

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.