WordNet (r) 3.0 (2006):

Marcus Antonius
    n 1: Roman general under Julius Caesar in the Gallic wars;
         repudiated his wife for the Egyptian queen Cleopatra; they
         were defeated by Octavian at Actium (83-30 BC) [syn:
         Antony, Anthony, Mark Antony, Mark Anthony,
         Antonius, Marcus Antonius]