Dictionary![]() ![]() Ac•ti•umPronunciation: (ak'tē-um, -shē-um), [key] —n. a promontory in NW ancient Greece: Antony and Cleopatra were defeated by Octavian and Agrippa in a naval battle near here in 31 b.c. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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