#1 train n. [railroad train] public transport provided by a line of railway cars coupled together and drawn by a locomotive; "express trains don't stop at Princeton Junction". wn
#2 train v. [develop, prepare, educate] create by training and teaching; "The old master is training world-class violinists"; "we develop the leaders for the future". wn
#3 train v. [prepare] undergo training or instruction in preparation for a particular role, function, or profession; "She is training to be a teacher"; "He trained as a legal aid". wn
#4 train v. [discipline, check, condition] develop (children's) behavior by instruction and practice; especially to teach self-control; "Parents must discipline their children"; "Is this dog trained?". wn
#5 train v. [prepare, groom] educate for a future role or function; "He is grooming his son to become his successor"; "The prince was prepared to become King one day"; "They trained him to be a warrior". wn
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