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English definition of “master”

master

noun [C] (TEACHER)    /ˈmɑː.stər/ US  /ˈmæs.tɚ/
UK old-fashioned a male school teacher : Mr Wells was my Latin master at school .Teachers Master (in the UK) the head of some schools or university colleges : The Master of St. John's College will be launching the appeal . → See also headmaster
(Definition of master noun (TEACHER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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