Source : Webster's Revised Unabridged Dictionary (1913)

Tour \Tour\, n. [F. tour. See {Tower}.]
   A tower. [Obs.] --Chaucer.

Tour \Tour\, n. [F. tour. See {Turn}, v. t.]
   1. A going round; a circuit; hence, a journey in a circuit; a
      prolonged circuitous journey; a comprehensive excursion;
      as, the tour of Europe; the tour of France or England.

            The bird of Jove stooped from his airy tour.
                                                  --Milton.

   2. A turn; a revolution; as, the tours of the heavenly
      bodies. [Obs.] --Blackmore.

   3. (Mil.) anything done successively, or by regular order; a
      turn; as, a tour of duty.

   Syn: Journey; excursion. See {Journey}.

Tour \Tour\, v. i. [imp. & p. p. {Toured}; p. pr. & vb. n.
   {Touring}.]
   To make a tourm; as, to tour throught a country. --T. Hughes.

Source : WordNet®

tour
     n 1: a journey or route all the way around a particular place or
          area; "they took an extended tour of Europe"; "we took a
          quick circuit of the park"; "a ten-day coach circuit of
          the island" [syn: {circuit}]
     2: a time for working (after which you will be relieved by
        someone else); "it's my go"; "a spell of work" [syn: {go},
         {spell}, {turn}]
     3: a period of time spent in military service [syn: {enlistment},
         {hitch}, {term of enlistment}, {tour of duty}, {duty tour}]

tour
     v : make a tour of a certain place; "We toured the Provence this
         summer"