Regulator word meaning and definition

[noun] a control that maintains a steady speed in a machine (as by controlling the supply of fuel)
[noun] any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
[noun] a official responsible for control and supervision of a particular activity or area of public interest

\Reg"u*la`tor\ (-l?`t?r), n. 1. One who, or that which, regulates. 2. (Mach.) 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. A clock, or other timepiece, used as a standard of correct time. See {Astronomical clock}
(a), under {Clock}. 4. 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 comission of violent crimes. [U.S.] A few stood neutral, or declared in favor of the Regulators. --Bancroft.

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