• Noun: a branch of knowledge; examples: "in what discipline is his doctorate?", "teachers should be well trained in their subject", "anthropology is the study of human beings"
• Noun: a system of rules of conduct or method of practice; examples: "he quickly learned the discipline of prison routine", "for such a plan to work requires discipline""
• Noun: the trait of being well behaved; example: "he insisted on discipline among the troops"
• Noun: training to improve strength or self-control
• Noun: the act of punishing; example: "the offenders deserved the harsh discipline they received"
• Verb: train by instruction and practice; especially to teach self-control; examples: "Parents must discipline their children", "Is this dog trained?"
• Verb: punish in order to gain control or enforce obedience; example: "The teacher disciplined the pupils rather frequently"