GalbaPronunciation: /ˈgalbə/Definition of Galba (circa 3 bc- ad 69), Roman emperor ad 68-9; full name Servius Sulpicius Galba. The successor to Nero, he aroused hostility by his severity and parsimony and was murdered in a conspiracy organized by Otho. Galba in other Oxford dictionaries Definition of Galba in the US English dictionary