Dictionarycal•i•berPronunciation: (kal'u-bur), [key] —n. 1. the diameter of something of circular section, esp. that of the inside of a tube: a pipe of three-inch caliber. 2. Ordn.the diameter of the bore of a gun taken as a unit of measurement. 3. degree of capacity or competence; ability: a mathematician of high caliber. 4. degree of merit or excellence; quality: the high moral caliber of the era. Also, esp. Brit.,cal'i•bre. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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