the diameter of something of circular section, especially that of the inside of a tube: a pipe of three-inch caliber.
Ordnance. the diameter of the bore of a gun taken as a unit of measurement.
degree of capacity or competence; ability: a mathematician of high caliber.
degree of merit or excellence; quality: the high moral caliber of the era.
Also, especially British, calibre.

1560–70; variant of calibre < Middle FrenchArabic qālib mold, last < Greek kālápous shoe last, equivalent to kāla- combining form of kâlon wood + poús foot (see -pod)

calibered; especially British, calibred, adjective

4. worth, distinction. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

1560s, "degree of merit or importance," from M.Fr. calibre (14c.), perhaps ultimately from Arabic qalib "a mold, last," perhaps from Gk. kalopodion "a shoemaker's last," lit. "little wooden foot," from kalon "wood" + podos gen. of pous "foot" (see foot). Arabic also used the
word in the sense "mold for casting bullets," which is the original literal meaning in English, though the earliest cited sense is a figurative one. Meaning "inside diameter of a gun barrel" is attested from 1580s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

caliber cal·i·ber (kāl'ə-bər)
The diameter of the inside of a round cylinder, such as a tube.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences for Calibers
Firearms of all calibers and types are commonly used for plinking.
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