1. (abbreviation) .  A piece of timber with a cross section of 4 inches square.
  2. (abbreviation) .  (automotive) A four-wheel-drive vehicle with a four-speed transmission.
  3. (abbreviation) .  (automotive) A four-wheel vehicle with four-wheel-drive.
  4. (abbreviation) .  (automotive) By extension, any four-wheel-drive vehicle.

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This entry was last updated on RefTopia from its source on 3/20/2012.