calibre or (esp N American) caliber /kalˈi-bər/

1. The diameter of a bullet or shell
2. The diameter of the bore of a gun or tube
3. Character or capacity, degree of suitability or excellence (figurative)

calˈibrāte transitive verb

1. To determine the diameter of a gun barrel or tube
2. To determine true values by comparison with an accurate standard
3. To mark or adjust gradations or positions on

calibrāˈtion noun

1. The act of calibrating
2. One of a series of marks or gradations that indicate values or positions

calˈibrātor noun

calˈibred or calˈibered adjective

calibrated airspeed noun (aeronautics)

An airspeed value obtained from instruments and corrected for instrument error but not for altitude

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