1. (n.) One who, or that which, regulates.

2. (n.) A contrivance for regulating and controlling motion, as: (a) The lever or index in a watch, which controls the effective length of the hairspring, and thus regulates the vibrations of the balance. (b) The governor of a steam engine. (c) A valve for controlling the admission of steam to the steam chest, in a locomotive.

3. (n.) A clock, or other timepiece, used as a standard of correct time. See Clock.

4. (n.) A member of a volunteer committee which, in default of the lawful authority, undertakes to preserve order and prevent crimes; also, sometimes, one of a band organized for the commission of violent crimes.

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