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master

noun [C] (CONTROLLER)
 
 
/ˈmɑː.stər/ US  /ˈmæs.tɚ/

Definition

B2 a person who has control over or responsibility for someone or something, or who is the most important or influential (= having most influence) person in a situation or organization: old-fashioned a slave and his master With careful training, a dog will obey its master completely.UK The Master of St. John's College will be launching the appeal.People in charge of or controlling other peopleBosses, managers and directors
(Definition of master noun (CONTROLLER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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