ome·​ga | \ ō-ˈmā-gə How to pronounce omega (audio) , -ˈmē- How to pronounce omega (audio) , -ˈme- How to pronounce omega (audio) \

Definition of omega

1 : the 24th and last letter of the Greek alphabet — see Alphabet Table
2 : the extreme or final part : end
3a : a negatively charged elementary particle that has a mass 3270 times the mass of an electron

called also omega minus

b : a very short-lived unstable meson with mass 1532 times the mass of an electron

called also omega meson

Examples of omega in a Sentence

Recent Examples on the Web Seeds are high in omega fatty acids, which boast a slew of health benefits. Hannah Selinger, Good Housekeeping, 27 Sep. 2021 Nourish them from the inside: Nutrients such as biotin, panthenol, vitamin E, protein, and omega 3-fatty acids stimulate hair growth. Essence, 16 Aug. 2021 While the argan and full-spectrum CBD oil blend helps seal in the moisture and deliver nourishing essential amino acids, omega fatty acids and phytonutrients to tired skin. Noma Nazish, Forbes, 28 May 2021 The formula has squalane, omega fatty acids, vitamin E, and vegan glycerin to instantly moisturize the skin. Jennifer Aldrich, Better Homes & Gardens, 15 Apr. 2021 Rich in punicic acid (aka omega 5 fatty acid) and antioxidants, pomegranate seed oil takes the center stage of the ingredient list on the 100% pure blend of botanical oils, fighting off free radicals and deeply hydrating skin. Celia Shatzman, Forbes, 29 May 2021 But for the time being Carbone is the alpha and the omega. Helen Rosner, The New Yorker, 19 May 2021 Overnight Detox Oil by Caudalie: Simply apply onto the face at bedtime to help stressed skin regenerate overnight thanks to the omega 6 and vitamin E. Felicity Carter, Forbes, 6 May 2021 My mom is the kind of environmentally fastidious gal who washes out plastic baggies, composts like a champ, and saves leftover salmon skin for our omega-loving doggos. Mackenzie Chung Fegan, Bon Appétit, 3 May 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'omega.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of omega

15th century, in the meaning defined at sense 1

History and Etymology for omega

Middle English, from Greek ō mega, literally, large o

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The first known use of omega was in the 15th century

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Last Updated

5 Oct 2021

Cite this Entry

“Omega.” Dictionary, Merriam-Webster, Accessed 21 Oct. 2021.

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English Language Learners Definition of omega

: the 24th and last letter of the Greek alphabet


variants: or ω- \ ō-​ˈmeg-​ə, -​ˈmā-​gə, especially British ˈō-​meg-​ə \

Medical Definition of omega

: of, relating to, or being a chemical group or position at the end of a molecular chain omega oxidation of fatty acids

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