discipline
noun UK /ˈdɪs.ə.plɪn/ US
discipline noun (TRAINING)
B2 [U] 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.
I don't have enough (self) discipline to save money.