Real Dictionary

station wagon
countable noun: A station wagon is a car with a long body, a door at the rear, and space behind the back seats.

station wagon in American English
an automobile with more cargo space than a comparable sedan model, two or four doors, a rear seat that folds down, and a rear door hinged in various ways
noun: an automobile with one or more rows of folding or removable seats behind the driver and no luggage compartment but an area behind the seats into which suitcases, parcels, etc., can be loaded through a tailgate

station wagon in British English
noun: a car with a comparatively long body containing a large carrying space, reached through a rear door: usually the back seats can be folded forward to increase the carrying space