Definition of "disciplinarian" [dis•ci•plin•a•ri•an]

• One that enforces or believes in strict discipline. (noun)
• Disciplinary. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "NEW YORK — Stu Jackson, the NBA disciplinarian, is one of five executives promoted by the league."
• "The second sort of means I call disciplinarian, as consisting in the due use and improvement of common arts and sciences, applied unto and made use of in the study of the Scriptures."
• "Hendry was known as a disciplinarian as a manager at Creighton yet, with Zambrano, he tolerated more nonsense than necessary."