n.
Pronunciation: ō - ' m ā -g ə , - ' m ē -, - ' me-
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 <reached the omega of his career>
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