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English definition of “regulator”

regulator

noun [C] uk   /ˈreɡ.jʊ.leɪ.tər/ us    /-t̬ɚ/
a device used to control things such as the speed of a clock, the temperature in a room, etc. an official who makes certain that the companies who operate a system, such as the national electricity supply, work effectively and fairly
(Definition of regulator from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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