Definition of disciplinarian noun from the Oxford Advanced Learner's Dictionary

 

disciplinarian

 noun
noun
BrE BrE//ˌdɪsəplɪˈneəriən//
 
; NAmE NAmE//ˌdɪsəplɪˈneriən//
 
 
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a person who believes in using rules and punishments for controlling people She's a very strict disciplinarian.
See the Oxford Advanced American Dictionary entry: disciplinarian