- (1729–96), empress of Russia, reigned 1762–96; known as Catherine the Great. She became empress after her husband, Peter III, was deposed; her attempted social and political reforms were impeded by the aristocracy. She formed alliances with Prussia and Austria, and made territorial advances at the expense of the Turks and Tartars.
More definitions of Catherine IIDefinition of Catherine II in:
- The US English dictionary