G1Pronunciation: /dʒiː/ (also g)Translate G | into French | into German | into Italian | into Spanish Definition of G noun (plural Gs or G's) 1the seventh letter of the alphabet. denoting the next after F in a set of items, categories, etc.. (g) Chess denoting the seventh file from the left, as viewed from White’s side of the board. 2 Music the fifth note in the diatonic scale of C major. a key based on a scale with G as its keynote. G in other Oxford dictionaries Definition of G in the US English dictionary