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master

noun [C] (TEACHER)
 
 
/ˈmɑː.stər/ US  /ˈmæs.tɚ/ UK old-fashioned

Definition

a male school teacher: Mr Wells was my Latin master at school. → See also headmasterTeachers
(Definition of master noun (TEACHER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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