—n. 1. training to act in accordance with rules; drill: military discipline. 2. activity, exercise, or a regimen that develops or improves a skill; training: A daily stint at the typewriter is excellent discipline for a writer. 3. punishment inflicted by way of correction and training.
4. the rigor or training effect of experience, adversity, etc.: the harsh discipline of poverty. 5. behavior in accord with rules of conduct; behavior and order maintained by training and control: good discipline in an army. 6. a set or system of rules and regulations.
7. Eccles.the system of government regulating the practice of a church as distinguished from its doctrine.
8. an instrument of punishment, esp. a whip or scourge, used in the practice of self-mortification or as an instrument of chastisement in certain religious communities.
9. a branch of instruction or learning: the disciplines of history and economics.
—v.t. 1. to train by instruction and exercise; drill.
2. to bring to a state of order and obedience by training and control.
3. to punish or penalize in order to train and control; correct; chastise.