Train  —v. 1 a (often foll. By to + infin.) Teach (a person, animal, oneself, etc.) A specified skill, esp. By practice. B undergo this process (trained as a teacher). 2 bring or come to physical efficiency by exercise, diet, etc. 3 (often foll. By along, up) guide the growth of (a plant). 4 (usu. As trained adj.) Make (the mind, eye, etc.) Discerning through practice etc. 5 (often foll. By on) point or aim (a gun, camera, etc.) At an object etc. —n. 1 series of railway carriages or trucks drawn by an engine. 2 thing dragged along behind or forming the back part of a dress, robe, etc. 3 succession or series of people, things, events, etc. (train of thought). 4 body of followers; retinue.  in train properly arranged or directed.  trainee n. [latin traho draw]