- (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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). calibre. Retrieved September 26, 2026, from http://smartdefine.org/calibre/definitions/1983910 |
| Chicago | Webster's. 2011. "calibre" http://smartdefine.org/calibre/definitions/1983910 (accessed September 26, 2026). |
| Harvard | Webster's 2011, calibre, Smart Define, viewed 26 September, 2026, <http://smartdefine.org/calibre/definitions/1983910>. |
| MLA | Webster's. "calibre" 27 May 2011. Web. 26 September 2026. <http://smartdefine.org/calibre/definitions/1983910> |