1 : the act, process, or method of one that trains b : the skill, knowledge, or experience acquired by one that trains.
2 : the state of being trained.
3 : A formal activity imparting a philosophy or technology to an individual or group and culminates in the award of a grade or certificate. It consists of trained training personnel who can train and the use of training drills and have the ability to work with the students to clean up their studies. (Admin Dictionary)