The Collaborative International Dictionary of English v.0.48:

Empire \Em"pire\, n. [F., fr. L. imperium a command,
   sovereignty, dominion, empire, fr. imperare. See Emperor;
   cf. Imperial.]
   1. Supreme power; sovereignty; sway; dominion. "The empire of
      the sea." --Shak.
      [1913 Webster]

            Over hell extend
            His empire, and with iron scepter rule. --Milton.
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   2. The dominion of an emperor; the territory or countries
      under the jurisdiction and dominion of an emperor (rarely
      of a king), usually of greater extent than a kingdom,
      always comprising a variety in the nationality of, or the
      forms of administration in, constituent and subordinate
      portions; as, the Austrian empire.
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            Empire carries with it the idea of a vast and
            complicated government.               --C. J. Smith.
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   3. Any dominion; supreme control; governing influence; rule;
      sway; as, the empire of mind or of reason. "Under the
      empire of facts." --M. Arnold.
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            Another force which, in the Middle Ages, shared with
            chivalry the empire over the minds of men. --A. W.
                                                  Ward.
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   Celestial empire. See under Celestial.

   Empire City, a common designation of the city of New York.


   Empire State, a common designation of the State of New
      York.

   Syn: Sway; dominion; rule; control; reign; sovereignty;
        government; kingdom; realm; state.
        [1913 Webster]

U.S. Gazetteer Places (2000):

Empire City, OK -- U.S. town in Oklahoma
   Population (2000):    734
   Housing Units (2000): 290
   Land area (2000):     10.834995 sq. miles (28.062507 sq. km)
   Water area (2000):    0.037523 sq. miles (0.097185 sq. km)
   Total area (2000):    10.872518 sq. miles (28.159692 sq. km)
   FIPS code:            23900
   Located within:       Oklahoma (OK), FIPS 40
   Location:             34.463922 N, 98.038008 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Empire City, OK
    Empire City