4WD 4WD /fɔr ˈdʌblˌjuˈdi/

noun

1. A transmission that provides power directly to all four wheels of a motor vehicle  ( 4WD , four-wheel drive )
   a transmission that provides power directly to all four wheels of a motor vehicle
    The four-wheel drive car was perfect for driving on rough and muddy terrain
   The four-wheel drive car was perfect for driving on rough and muddy terrain
   
   
2. A motor vehicle with a four-wheel drive transmission system  ( 4WD , four-wheel drive )
   a motor vehicle with a four-wheel drive transmission system