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 父母的训导／军事训练／校规

There should be tougher discipline in schools. 学校的纪律应该更严一些。

I don't have enough (self) discipline to save money. 我总是控制不住自己花钱的欲望。

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. 维护课堂纪律是每位教师的首要任务。

a particular area of study, especially a subject studied at a college or university

to punish someone

A senior army officer has been disciplined for revealing secret government plans to the media. 一名高级军官因向媒体透露政府秘密计划而受到惩罚。

to teach someone to behave in a controlled way

[ + to infinitive ] I'm trying to discipline myself to eat less chocolate. 我正试图控制自己少吃巧克力。