disciplinarian

[dis-uh-pluh-nair-ee-uhn]
noun
1.
a person who enforces or advocates discipline: The teacher was a formidable disciplinarian.
adjective

Origin:
1575–85; discipline + -arian

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World English Dictionary
disciplinarian (ˌdɪsɪplɪˈnɛərɪən)
 
n
1.  a person who imposes or advocates discipline
 
adj
2.  a less common word for disciplinary

disciplinary or disciplinarian (ˈdɪsɪˌplɪnərɪ)
 
adj
1.  of, promoting, or used for discipline; corrective
2.  relating to a branch of learning: criticism that crosses disciplinary boundaries
 
disciplinarian or disciplinarian
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

disciplinarian
"one who enforces order," 1630s, see discipline; earlier used of Puritans who wanted to establish the Presbyterian "discipline" in England (1580s). Meaning "advocate of greater discipline" is from 1746.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
She describes her late father as a disciplinarian who was constantly angry.
There are plenty of laughs in this picture-at the disciplinarian's expense.
He may have been stern and a disciplinarian, but he regularly regaled his
  family with funny accounts of his travels abroad.
One type of error relates to how the principal or school disciplinarian
  provided information for the survey.
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