Source : Webster's Revised Unabridged Dictionary (1913)

Dominion \Do*min"ion\, n. [LL. dominio, equiv. to L. dominium.
   See {Domain}, {Dungeon}.]
   1. Sovereign or supreme authority; the power of governing and
      controlling; independent right of possession, use, and
      control; sovereignty; supremacy.

            I praised and honored him that liveth forever, whose
            dominion is an everlasting dominion.  --Dan. iv. 34.

            To choose between dominion or slavery. --Jowett
                                                  (Thucyd. ).

   2. Superior prominence; predominance; ascendency.

            Objects placed foremost ought . . . have dominion
            over things confused and transient.   --Dryden.

   3. That which is governed; territory over which authority is
      exercised; the tract, district, or county, considered as
      subject; as, the dominions of a king. Also used
      figuratively; as, the dominion of the passions.

   4. pl. A supposed high order of angels; dominations. See
      {Domination}, 3. --Milton.

            By him were all things created . . . whether they be
            thrones, or dominions, or principalities, or powers.
                                                  --Col. i. 16.

   Syn: Sovereignty; control; rule; authority; jurisdiction;
        government; territory; district; region.

Source : WordNet®

dominion
     n 1: dominance or power through legal authority; "France held
          undisputed dominion over vast areas of Africa"; "the
          rule of Caesar" [syn: {rule}]
     2: a region marked off for administrative or other purposes
        [syn: {district}, {territory}, {territorial dominion}]
     3: one of the self-governing nations in the British
        Commonwealth