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.

Calibre n. : The diameter of round or cylindrical body, as of a bullet or column.

Calibre n. : Fig.: Capacity or compass of mind.

Example:
What is the difference between 45 Calibre vs. 357 magnum?

Taxonomy
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Defination from the web:
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