Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The diameter of the inside of a round cylinder, such as a tube.
  • n. The diameter of the bore of a firearm, usually shown in hundredths or thousandths of an inch and expressed in writing or print in terms of a decimal fraction: .45 caliber.
  • n. The diameter of a large projectile, such as an artillery shell, measured in millimeters or in inches.
  • n. Degree of worth; quality: a school of high caliber; an executive of low caliber.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. US spelling of calibre.

from the GNU version of the Collaborative International Dictionary of English

  • n. The diameter of the bore, as a cannon or other firearm, or of any tube; or the weight or size of the projectile which a firearm will carry.
  • n. The diameter of round or cylindrical body, as of a bullet or column.
  • n. Fig.: Capacity or compass of mind.

from The Century Dictionary and Cyclopedia

  • In gunnery, to ascertain the caliber of; calibrate. See caliper.
  • n. The diameter of a body, especially of the hollow inside of a cylinder: as, the caliber of a piece of ordnance or other firearm.
  • n. Figuratively, compass or capacity of mind; the extent of one's intellectual endowments.
  • n. In horology: The distance between the two plates of a watch which determines the flatness of the movement.
  • n. The plate upon which is traced the arrangement of the pieces of a clock; the pattern-plate.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a degree or grade of excellence or worth
  • n. diameter of a tube or gun barrel

Etymologies

French calibre, from Italian calibro, from Arabic qālib, qālab, mold, shoe tree, from Greek kālapous, shoemaker's last : kālon, wood + pous, foot.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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