Tiberius play biographical name Ti·be·ri·us \tī-ˈbir-ē-əs\ Definition of Tiberius 42 b.c.–a.d. 37 Tiberius Claudius Nero Caesar Augustus Rom. emp. (14–37) Rhymes with tiberius cinereous, delirious, Guarnerius, imperious, mysterious Learn More about tiberius Britannica.com: Encyclopedia article about "Tiberius" Seen and Heard What made you want to look up Tiberius? Please tell us where you read or heard it (including the quote, if possible).