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English to English noun
| 1 |
a degree or grade of excellence or worth |  | Example: the quality of students has risen
an executive of low caliber
source: wordnet30
| 2 |
diameter of a tube or gun barrel | | source: wordnet30
| 3 |
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. | | source: webster1913
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