The quality of students has risen. An executive of low caliber.
source: WordNet 3.0
diameter of a tube or gun barrel
source: WordNet 3.0
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.
