Calibre

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Calibre

(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; as, an 8 inch gun, a 12-pounder, a 44 caliber.
(n.) The diameter of round or cylindrical body, as of a bullet or column.
(n.) Fig.: Capacity or compass of mind.