Definition of "Discipline" :

noun: training to improve strength or self-control

noun: the act of disciplining

"The offenders deserved the harsh discipline they received."

noun: the trait of being well behaved

"He insisted on discipline among the troops."

noun: a system of rules of conduct or method of practice

"He quickly learned the discipline of prison routine."

noun: a branch of knowledge

"In what discipline is his doctorate?."

verb: punish in order to gain control or enforce obedience

"The teacher disciplined the pupils rather frequently."

verb: develop (a child's or animal's) behavior by instruction and practice; especially to teach self-control

"Parents must discipline their children."