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English definition of “controller”

controller

noun [C]     /kənˈtrəʊ.lər/ US  /-ˈtroʊ.lɚ/
a person who controls something, or someone who is responsible for what a particular organization does: an air-traffic controller That was the year he became Controller of Radio 4.People in charge of or controlling other peopleBosses, managers and directors
(Definition of controller noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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