CaesarPronunciation: /ˈsiːzə/Definition of Caesar noun 1a title of Roman emperors, especially those from Augustus to Hadrian. an autocrat: they complained that he was behaving like a Caesar 2 Medicine, British informal a caesarean section. Phrases Caesar's wife a person who is required to be above suspicion. [with reference to Plutarch's Caesar ( x. 6) ‘I thought my wife ought not even to be under suspicion’]Origin: Middle English: from Latin Caesar, family name of the Roman statesman Julius Caesar, GaiusCaesar in other Oxford dictionaries Definition of Caesar in the US English dictionary