The Collaborative International Dictionary of English v.0.48:

Tour \Tour\, n. [F. tour. See Tower.]
   A tower. [Obs.] --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.
      [1913 Webster]

            The bird of Jove stooped from his airy tour.
                                                  --Milton.
      [1913 Webster]

   2. A turn; a revolution; as, the tours of the heavenly
      bodies. [Obs.] --Blackmore.
      [1913 Webster]

   3. (Mil.) anything done successively, or by regular order; a
      turn; as, a tour of duty.
      [1913 Webster]

   Syn: Journey; excursion. See Journey.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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: tour, 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, tour, turn]
    3: a period of time spent in military service [syn:
       enlistment, hitch, term of enlistment, tour of duty,
       duty tour, tour]
    v 1: make a tour of a certain place; "We toured the Provence
         this summer"

Moby Thesaurus II by Grady Ward, 1.0:

160 Moby Thesaurus words for "tour":
   air lane, ambit, anchor watch, antenna tower, assignment, barbican,
   beat, belfry, bell tower, bit, booking, borscht circuit, bout,
   campaign, campanile, circle, circuit, colossus, column,
   continuous tenure, course, cruise, cupola, cycle, date, day shift,
   derrick, dogwatch, dome, drive, engagement, enlistment, excursion,
   expedition, fare, fire tower, flight path, full circle, full time,
   globe-trot, go, go abroad, go on safari, go overseas, grand tour,
   graveyard shift, half time, hit the trail, hitch, itinerary, jaunt,
   journey, junket, lantern, lap, lighthouse, line, lobster trick,
   loop, make a journey, make a pilgrimage, make a trip, martello,
   martello tower, mast, minaret, monument, night shift, obelisk,
   observation tower, orbit, outing, overtime, package tour, pagoda,
   part time, path, perambulation, peregrinate, peregrination,
   pilaster, pilgrim, pilgrimage, pillar, pinnacle,
   playing engagement, pleasure trip, pole, primrose path,
   prison term, progress, pylon, pyramid, ramble, range the world,
   relay, revolution, road, round, round trip, roundabout, rounds,
   route, rubberneck, rubberneck tour, run, safari, sally, sea lane,
   shaft, shift, shoot, shortcut, sight-see, skyscraper, spell, spire,
   split schedule, split shift, stalk, stand, standpipe, steeple,
   stint, stretch, stroll, stupa, sunrise watch, swing shift,
   take a trip, take the road, television mast, tenure, term, time,
   tope, tour of duty, tower, track, trade route, traject, trajectory,
   trajet, travel, trek, trick, trip, turn, turn of work, turret,
   vaudeville circuit, visit, voyage, walk, walkabout, watch,
   water tower, wayfare, windmill tower, work shift