<p><strong>Noun</strong></p><ul><li>a person or thing that regulates.</li><li>Horology: an adjustable device in a clock or a watch for making it go faster or slower.</li><li>a master clock, usually of great accuracy, against which other clocks are checked.</li><li>Machinery: a governor mechanism for regulating the flow of fuel, steam, etc., to an engine in order to maintain constant speed under varying load or resistance.</li><li>a valve for regulating the pressure of flowing gas or liquid to maintain a predetermined pressure.</li><li>any of various mechanisms for maintaining a temperature, a level of liquid in a tank, etc.</li><li>Electricity: a device for maintaining a designated characteristic, as voltage or current, at a predetermined value, or for varying it according to a predetermined plan.</li><li>a device on scuba equipment for regulating the rate at which compressed air is fed through a breathing tube in proportion to the depth of water.</li><li>a device for maintaining a constant gas pressure.</li><li>(initial capital letter) American History: a member of any of several bands or committees in North Carolina (1767–71), formed to resist certain abuses, as extortion by officials.</li><li>(in newly settled areas) a member of any band or committee organized to preserve order before the establishment of regular legal authority.</li></ul>