Definitions of wagon:

• noun:   any of various kinds of wheeled vehicles drawn by a horse or tractor
• noun:   a child's four-wheeled toy cart sometimes used for coasting
• noun:   a car that has a long body and rear door with space behind rear seat
• noun:   van used by police to transport prisoners
• noun:   a group of seven bright stars in the constellation Ursa Major
• name:  A surname (very rare: popularity rank in the U.S.: #76414)