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Synonyms
cal·i·ber (kăĺə-bər)

[French calibre, from Italian calibro, from Arabic qālib, qālab, mold, shoe tree, from Greek kālapous, shoemaker's last, kālon, wood, + pous, foot.]

noun 

    1. The diameter of the inside of a round cylinder, such as a tube.
    2. 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.
    3. The diameter of a large projectile, such as an artillery shell, measured in millimeters or in inches.
  2. Degree of worth; quality: a school of high caliber; an executive of low caliber.