Claudius Syllabification: (Clau·di·us)Pronunciation: /ˈklôdēəs/Definition of Claudius (10 bc- ad 54), Roman emperor 41-54; full name Tiberius Claudius Drusus Nero Germanicus. He restored order after Caligula’s decadence and expanded the empire, in particular by invading Britain in ad 43. Claudius in other Oxford dictionaries Definition of Claudius in the British & World English dictionary