disciplines

Disciplines are fields of study or practice with their own methods and standards: academic disciplines like physics or philosophy, artistic disciplines like ballet.

The word also means controlled behavior and the training that produces it: Military discipline kept the troops calm under fire.

To discipline someone is to punish or correct them, especially children.

Self-discipline is the ability to make yourself do difficult things.

As a verb, discipline also means to train systematically: She disciplined herself to write every morning.