1. The internal diameter of a gun barrel or tube.
Usage: technical; military
2. The degree of excellence or importance of a person or thing; quality or ability.

Examples

• The rifle has a .308 calibre barrel.
• She is a scientist of the highest calibre.
• The company only hires employees of exceptional calibre.
• His work demonstrates a calibre that few can match.
• The calibre of the debate was disappointing.
• A musician of such calibre deserves international recognition.