discipline

1. Discipline is the practice of making people obey rules or standards of behaviour, and pushing them when they do not.

(行動の規則や基準に人を従わせ、従わないときに無理やり強いる行為→統制、しつけ)

2. Discipline is the quality of being able to behave and work in a controlled way which involves obeying particular rules or standards.

（特定の規則や基準に従うようにきちんとしたやり方で行動したり働いたりできる能力→自制、鍛錬）

(Collins English Dictionary)