noun
a person who enforces or advocates for discipline, especially in a strict or authoritarian manner
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The headmaster was known to be a strict disciplinarian, enforcing rules with unwavering consistency.
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My dad is a bit of a disciplinarian when it comes to curfew, always making sure I'm home on time.
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The coach is a real disciplinarian, always making us run extra laps if we're late to practice.
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In her role as team captain, she acted as a disciplinarian, ensuring everyone followed the game plan.