Merriam-Webster’s definition of discipline is as follows
3: a rule or system of rules governing conduct or activity.
By this definition we can safely say for a trader to have discipline the trader must have gone through mental training to build character, the trader must be obedient to the rules or system of rules governing their trading strategy and a trader must have self-control to handle their impulsive tendencies. Once a trader has mastered the art of applying discipline to their trading style mastering their strategy will become less of a challenge.
Next: Tips for developing discipline as a trader