G Meaning of G in English 1. n. (also g) (pl. Gs or G's) 1. the seventh letter of the alphabet. 2 Mus. the fifth note in the diatonic scale of C major. 2. abbr. (also G.) 1. gauss. 2 giga-. 3 gravitational constant. 4 US sl. GRAND n. 2. Oxford English vocab. Оксфордский английский словарь. 2012