Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From its dimensions (4 inches by 4 inches)

from Wiktionary, Creative Commons Attribution/Share-Alike License

From four-wheel drive and four-speed

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