Main Entry: ome·ga

Pronunciation: \ō-ˈmā-gə, -ˈmē-, -ˈme-\

Function: noun

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

Date: 15th century

1 : the 24th and last letter of the Greek alphabet — see alphabet table
2 : the extreme or final part : end
3 a : 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