1. the practice of training people to obey rules or a code of behavior
2. a branch of knowledge, typically one studied in higher education
3. the controlled behavior resulting from disciplinary training; self-control

1. to train someone to obey rules or a code of behavior
2. to punish someone in order to correct their behavior

Examples

• The military requires strict discipline from all soldiers.
• Mathematics is a challenging academic discipline.
• She showed great discipline by studying every night.
• The teacher had to discipline the disruptive student.
• Good discipline in the classroom helps students learn better.
• His discipline and hard work led to success.
• The coach will discipline players who miss practice.
• Psychology is her favorite discipline to study.