train (n.)

early 14c., "a drawing out, delay;" late 14c., "trailing part of a skirt, gown, or cloak;" also "retinue, procession," from Old French train "tracks, path, trail (of a rome or gown); act of dragging," from trainer "to pull, drag, draw," from Vulgar Latin *traginare, extended from *tragere "to pull," back-formation from tractus, past participle of Latin trahere "to pull, draw" (see tract (n.1)).,

General sense of "series, progression, succession, continuous course" is from late 15c. Train of thought first attested 1650s. The railroad sense "locomotive and the cars coupled to it" is recorded from 1820 (publication year, dated 1816), from notion of a "train" of wagons or carriages pulled by a mechanical engine.

train (v.)

"to discipline, teach, bring to a desired state by means of instruction," 1540s, probably from earlier sense of "draw out and manipulate in order to bring to a desired form" (late 14c.), specifically of the growth of branches, vines, etc. from mid-15c.; from train (n.). Sense of "point or aim" (a firearm, etc.) is from 1841. Sense of "fit oneself for a performance by a regimen or exercise" is from 1832. The meaning "to travel by railway" is recorded from 1856. Related: Trained; training.

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Definitions of train from WordNet
train (v.)
create by training and teaching;
The old master is training world-class violinists
Synonyms: develop / prepare / educate
train (v.)
undergo training or instruction in preparation for a particular role, function, or profession;
He trained as a legal aid
She is training to be a teacher
Synonyms: prepare
train (v.)
develop (a child's or animal's) behavior by instruction and practice; especially to teach self-control;
Is this dog trained?
Synonyms: discipline / check / condition
train (v.)
educate for a future role or function;
They trained him to be a warrior
Synonyms: prepare / groom
train (v.)
teach or refine to be discriminative in taste or judgment;
Synonyms: educate / school / cultivate / civilize / civilise
train (v.)
point or cause to go (blows, weapons, or objects such as photographic equipment) towards;
Don't train your camera on the women
He trained his gun on the burglar
Synonyms: aim / take / take aim / direct
train (v.)
teach and supervise (someone); act as a trainer or coach (to), as in sports;
He is training our Olympic team
Synonyms: coach
train (v.)
exercise in order to prepare for an event or competition;
She is training for the Olympics
train (v.)
cause to grow in a certain way by tying and pruning it;
train the vine
train (v.)
travel by rail or train;
She trained to Hamburg
Synonyms: rail
train (v.)
drag loosely along a surface; allow to sweep the ground;
She trained her long scarf behind her
Synonyms: trail
train (n.)
public transport provided by a line of railway cars coupled together and drawn by a locomotive;
express trains don't stop at Princeton Junction
Synonyms: railroad train
train (n.)
a sequentially ordered set of things or events or ideas in which each successive member is related to the preceding;
a train of thought
train of mourners
Synonyms: string
train (n.)
a procession (of wagons or mules or camels) traveling together in single file;
they joined the wagon train for safety
Synonyms: caravan / wagon train
train (n.)
a series of consequences wrought by an event;
it led to a train of disasters
train (n.)
piece of cloth forming the long back section of a gown that is drawn along the floor;
the bride's train was carried by her two young nephews
train (n.)
wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed;
Synonyms: gearing / gear / geartrain / power train