<p><strong>Noun</strong></p><ul><li>Training to act in accordance with rules; drill: military discipline.</li><li>An activity, exercise, or regimen that develops or improves a skill; training: Sticking to specific and regular mealtimes is excellent discipline for many dieters.</li><li>A branch of instruction or learning: the disciplines of history and economics.</li><li>Punishment inflicted by way of correction and training.</li><li>The rigor or training effect of experience, adversity, etc.: the harsh discipline of poverty.</li><li>Behavior in accord with rules of conduct; behavior and order maintained by training and control: good discipline in an army.</li><li>A set or system of rules and regulations.</li><li>Ecclesiastical: the system of government regulating the practice of a church as distinguished from its doctrine.</li><li>An instrument of punishment, especially a whip or scourge, used in the practice of self-mortification or as an instrument of chastisement in certain religious communities.</li></ul><p><strong>Verb</strong></p><ul><li>To train by instruction and exercise; drill.</li><li>To bring to a state of order and obedience by training and control.</li><li>To punish or penalize in order to train and control; correct; chastise.</li></ul>