The Collaborative International Dictionary of English v.0.48:

Wagon \Wag"on\, n. [D. wagen. [root]136. See Wain.]
   [1913 Webster]
   1. A wheeled carriage; a vehicle on four wheels, and usually
      drawn by horses; especially, one used for carrying freight
      or merchandise.
      [1913 Webster]

   Note: In the United States, light wagons are used for the
         conveyance of persons and light commodities.
         [1913 Webster]

   2. A freight car on a railway. [Eng.]
      [1913 Webster]

   3. A chariot [Obs.] --Spenser.
      [1913 Webster]

   4. (Astron.) The Dipper, or Charles's Wain.
      [1913 Webster]

   Note: This word and its compounds are often written with two
         g's (waggon, waggonage, etc.), chiefly in England. The
         forms wagon, wagonage, etc., are, however,
         etymologically preferable, and in the United States are
         almost universally used.
         [1913 Webster]

   Wagon boiler. See the Note under Boiler, 3.

   Wagon ceiling (Arch.), a semicircular, or wagon-headed,
      arch or ceiling; -- sometimes used also of a ceiling whose
      section is polygonal instead of semicircular.

   Wagon master, an officer or person in charge of one or more
      wagons, especially of those used for transporting freight,
      as the supplies of an army, and the like.

   Wagon shoe, a skid, or shoe, for retarding the motion of a
      wagon wheel; a drag.

   Wagon vault. (Arch.) See under 1st Vault.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Wagon \Wag"on\, v. t. [imp. & p. p. Wagoned; p. pr. & vb. n.
   Wagoning.]
   To transport in a wagon or wagons; as, goods are wagoned from
   city to city.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Wagon \Wag"on\, v. i.
   To wagon goods as a business; as, the man wagons between
   Philadelphia and its suburbs.
   [1913 Webster]

WordNet (r) 3.0 (2006):

wagon
    n 1: any of various kinds of wheeled vehicles drawn by an animal
         or a tractor [syn: wagon, waggon]
    2: van used by police to transport prisoners [syn: police van,
       police wagon, paddy wagon, patrol wagon, wagon,
       black Maria]
    3: a group of seven bright stars in the constellation Ursa Major
       [syn: Big Dipper, Dipper, Plough, Charles's Wain,
       Wain, Wagon]
    4: a child's four-wheeled toy cart sometimes used for coasting
       [syn: wagon, coaster wagon]
    5: a car that has a long body and rear door with space behind
       rear seat [syn: beach wagon, station wagon, wagon,
       estate car, beach waggon, station waggon, waggon]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "wagon":
   Black Maria, Conestoga wagon, barge, boat, bus, caravan, carryall,
   cart, coach, covered wagon, cruiser, dray, ferry, float, haul,
   haywagon, lighter, paddy wagon, patrol car, patrol wagon,
   police van, prairie schooner, prowl car, raft, ship, sled, sledge,
   squad car, truck, van, waggon, wain, wheelbarrow



Easton's 1897 Bible Dictionary:

Wagon
   Heb. aghalah; so rendered in Gen. 45:19, 21, 27; 46:5; Num. 7:3,
   7,8, but elsewhere rendered "cart" (1 Sam. 6:7, etc.). This
   vehicle was used for peaceful purposes. In Ezek. 23:24, however,
   it is the rendering of a different Hebrew word, and denotes a
   war-chariot.