Supreme power; sovereignty; sway; dominion.
- A political unit having an extensive territory or comprising a number of territories or nations and ruled by a single supreme authority.
- The territory included in such a unit.
- An extensive enterprise under a unified authority: a publishing empire.
- Imperial or imperialistic sovereignty, domination, or control: "There is a growing sense that the course of empire is shifting toward the . . . Asians” ( James Traub).