1. a person who believes in or practices strict discipline

Examples

• The new principal was known as a strict disciplinarian who enforced all school rules.
• My father was a disciplinarian who expected us to follow a rigid schedule.
• The coach’s reputation as a disciplinarian helped the team improve their performance.
• She was considered a fair but firm disciplinarian in her classroom.
• The military academy attracted students who thrived under disciplinarian leadership.
• Despite being a disciplinarian, he genuinely cared about his students’ success.