Wordnet 3.0
NOUN (2)
1.
an ancient town on a promontory in western Greece;
2.
the naval battle in which Antony and Cleopatra were defeated by Octavian's fleet under Agrippa in 31 BC;
The Collaborative International Dictionary of English v.0.48:
Actium \Actium\ n.
1. naval battle where Antony and Cleopatra were defeated by
Octavian's fleet under Agrippa in 31 BC.
[WordNet 1.5]
WordNet (r) 3.0 (2006):
Actium
n 1: an ancient town on a promontory in western Greece
2: the naval battle in which Antony and Cleopatra were defeated
by Octavian's fleet under Agrippa in 31 BC