disciplinarian

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disciplinarian /ˌdɪsəpləˈnerijən/ noun
plural disciplinarians
disciplinarian
/ˌdɪsəpləˈnerijən/
noun
plural disciplinarians
Learner's definition of DISCIPLINARIAN
[count]
: a person who is very strict about punishing bad behavior : a person who uses discipline as a way of making sure that rules or orders are obeyed