training that makes people more willing to obey or more able to control themselves, often in the form of rules, and punishments if these are broken, or the behaviour produced by this training:
parental/military/school discipline
There should be tougher discipline in schools.
(self) discipline I don't have enough (self) discipline to save money.
the ability to control yourself or other people, even in difficult situations:
Maintaining classroom discipline (= control of the students) is the first task of every teacher.