- the 24th and last letter of the Greek alphabet (Ω, ω).
- the vowel sound represented by this letter.
- the last of any series; the end.
- omega baryon.
- omega meson.
- the 24th and last letter of the Greek alphabet (Ω, ω), a long vowel, transliterated as o or ō
- the ending or last of a series
c.1400, from Medieval Greek omega, from classical Greek o mega “big ‘o’ ” (in contrast to o micron “little ‘o’ “); so called because the vowel was long in ancient Greek. From mega (see mega-). The final letter of the Greek alphabet, hence used figuratively for “the last, final” of anything (cf. Rev. i:8), n.
- The 24th letter of the Greek alphabet.
- Of or characterizing a chemical group or position at the end of a molecular chain, such as omega-oxidation.
- An omega baryon.
- An omega meson.
see alpha and omega.