four-wheel drive

noun Automotive.
1.
a drive system in which engine power is transmitted to all four wheels for improved traction.
2.
a vehicle having such a system. Abbreviation: 4WD

Origin:
1925–30

four-wheel-drive, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
four-wheel drive
 
n
a system used in motor vehicles in which all four wheels are connected to the source of power

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The park is a motorcycle, four-wheel drive, and all-terrain vehicle use area.
Rough tracks that require four-wheel drive vehicles and paths are included for
  adventurers seeking to explore more remote regions.
They only wanted the latest four-wheel drive gas-guzzlers seen in glossy
  magazines.
Two-door and four-door bodies are available, either with rear-wheel or
  four-wheel drive.
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