four-wheel drive

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four-wheel drive

a system used in motor vehicles in which all four wheels are connected to the source of power
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

four-wheel drive

[′fȯr ¦wēl ′drīv]
(mechanical engineering)
An arrangement in which the drive shaft acts on all four wheels of the automobile.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.