What does the word disciplinarian mean?

Usage examples for disciplinarian

  1. " No sitting down, yet," Frank commanded, still in his inflexible tones of a disciplinarian. – Angel Island by Inez Haynes Gillmore
  2. Miss Kelly was a disciplinarian, and of a very suspicious temperament. – The Luckiest Girl in the School by Angela Brazil
  3. It is difficult to understand how the sternest disciplinarian, being human, could have treated his own motherless boy with such severity. – The Life of Froude by Herbert Paul