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Calibre

A term used to describe the form and/or size of a movement and often specifying the type of movement.

Chronograph

A watch with a stopwatch mechanism.

Chronometer

Movements the accuracy of which has been tested and passed by an official 15-day series of tests by the COSC, over a range of temperatures and five physical positions. The average daily deviation rate of the movement must be between –4 and +6 seconds and only then does the movement earn the right to be designated as a chronometer and receive a certificate issued by the COSC.

C.O.S.C

Contrôle Officiel des Chronomètres is an independent non profit testing organisation based in Switzerland.