to give the discipline and instruction, drill, practice, etc., designed to impart proficiency or efficiency.
27.
to undergo discipline and instruction, drill, etc.
28.
to get oneself into condition for an athletic performance through exercise, diet, practice, etc.
29.
to travel or go by train: to train to New York.
Origin: 1350–1400; (v.) late Middle English traynyn to pull or drag in the rear < Middle French trainer,Old French tra(h)iner < Vulgar Latin *tragīnāre, derivative of *tragīna something dragged or drawn (compare Medieval Latin tragīna carriage), derivative of *tragere to pull, for Latin trahere; (noun) Middle English train, traine < Old French tra(h)in (masculine) series of people, animals, or things, tra(h)ine (feminine) something dragged behind, both derivative of tra(h)iner
"instruct, discipline, teach," 1540s, from train (n.), probably from earlier sense of "draw out and manipulate in order to bring to a desired form" (late 14c.). The meaning "to travel by railway" is recorded from 1856. Trainer is recorded from c.1600; trainee from 1841.