WordNet (r) 3.0 (2006):
Gaius Octavianus n 1: Roman statesman who established the Roman Empire and became emperor in 27 BC; defeated Mark Antony and Cleopatra in 31 BC at Actium (63 BC - AD 14) [syn: Augustus, Gaius Octavianus, Gaius Julius Caesar Octavianus, Octavian]