disciplinarian

discipline +‎ -arian or disciplinary +‎ -an

• (UK) IPA^(key): /dɪsɪplɪˈnɛəɹɪən/

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disciplinarian (plural disciplinarians)

1. One who exercises discipline.

   He is the chief disciplinarian in the school.

   • 1923, Lucy Maud Montgomery, “Chapter 8”, in Emily of New Moon:

     Miss Brownell had the reputation in Blair Water of being a fine teacher—due mainly to the fact that she was a strict disciplinarian and kept excellent “order.”

2. (by extension) One who believes in discipline as a tool for regulation or control.

• disciple

disciplinarian (comparative more disciplinarian, superlative most disciplinarian)

1. Relating to discipline.
   • 1855, Henry Hart Milman, History of Latin Christianity‎:

     Disciplinarian system.