train

noun

1. The elongated back portion of a dress or skirt (or an ornamental piece of material added to similar effect), which drags along the ground.
2. A trail or line of something, especially gunpowder.
3. The tail of a bird.
4. The tail of an animal in general.
5. The elongated body or form of something narrow and winding, such as the course of a river or the body of a snake.
6. A transient trail of glowing ions behind a large meteor as it falls through the atmosphere or accompanying a comet as it nears the sun; tail.
7. An animal's trail or track.
8. Something dragged or laid along the ground to form a trail of scent or food along which to lure an animal.
9. Gait or manner of running of a horse.
10. A group of people following an important figure such as a king or noble; a retinue, a group of retainers.
11. A group of animals, vehicles, or people that follow one another in a line, such as a wagon train; a caravan or procession.
12. A group or class of people.
13. The men and vehicles following an army, which carry artillery and other equipment for battle or siege.
14. A sequence of events or ideas which are interconnected; a course or procedure of something.
15. A set of things, events, or circumstances that follow after or as a consequence; aftermath, wake.
16. State of progress, status, situation (in phrases introduced by in a + adjective); also proper order or situation (introduced by in or in a alone).
17. A set of interconnected mechanical parts which operate each other in sequence.
18. A series of electrical pulses.
19. A series of specified vehicles (originally tramcars in a mine as usual, later especially railway carriages) coupled together.
20. A mechanical (originally steam-powered, now typically diesel or electrical) vehicle carrying a large number of passengers and freight along a designated track or path; a line of connected wagons considered overall as a mode of transport; (as uncountable noun) rail or road travel.