Definitions for "Four-wheel drive"
Vehicle transmission system in which engine power is applied to all four wheels. The term 4x4 (four by four) has the specific connotation that it is a four (wheeled vehicle driven) by four (wheels).
No more than two wheels may be driven in Formula One. Four-wheel drive has been banned since the end of 1971.
a motor vehicle with a four-wheel drive transmission system
a necessity although many journeys to Kooringal at the southern end of the island are for fishing