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 minusb : a very short-lived unstable meson with mass 1532 times the mass of an electron —called also omega meson
Recent Examples of omega from the Web
Omega also amended a $250 million senior unsecured term loan credit facility and a subsidiary entered into a new $100 million senior unsecured term loan credit facility to replace one of the same size.
In a way, the watch is a cheat, because there is nothing so inconspicuous as a wristwatch—particularly in the 1970s and ’80s, when no one thought twice about seeing a Seiko or Omega on someone’s wrist.
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.
Origin and Etymology of omega
Middle English, from Greek ō mega, literally, large o
First Known Use: 15th century
OMEGA Defined for English Language Learners
Definition of omega for English Language Learners
: the 24th and last letter of the Greek alphabet
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