| trail | (noun) a path or track roughly blazed through wild or hilly country | - |
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| (noun) evidence pointing to a possible solution | Synonyms: lead, track |
| (noun) a track or mark left by something that has passed | - |
| trailblazer | (noun) someone who marks a trail by leaving blazes on trees | - |
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| (noun) someone who helps to open up a new line of research or technology or art | Synonyms: groundbreaker, innovator, pioneer |
| trailer | (noun) a wheeled vehicle that can be pulled by a car or truck and is equipped for occupancy | Synonyms: house trailer |
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| (noun) a large transport conveyance designed to be pulled by a truck or tractor | - |
| (noun) an advertisement consisting of short scenes from a motion picture that will appear in the near future | Synonyms: preview, prevue |
| (noun) someone who takes more time than necessary; someone who lags behind | Synonyms: dawdler, drone, laggard, lagger, poke |
| trailhead | (noun) the beginning of a trail | Synonyms: trail head |
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| trailing | (noun) the pursuit (of a person or animal) by following tracks or marks they left behind | Synonyms: tracking |
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| train | (noun) public transport provided by a line of railway cars coupled together and drawn by a locomotive | Synonyms: railroad train |
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| (noun) wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed | Synonyms: gear, gearing, geartrain, power train |
| (noun) piece of cloth forming the long back section of a gown that is drawn along the floor | - |
| (noun) a series of consequences wrought by an event | - |
| (noun) a procession (of wagons or mules or camels) traveling together in single file | Synonyms: caravan, wagon train |
| (noun) a sequentially ordered set of things or events or ideas in which each successive member is related to the preceding | Synonyms: string |
| trainband | (noun) a company of militia in England or America from the 16th century to the 18th century | - |
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| trainbandsman | (noun) a member of a trainband | - |
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| trainbearer | (noun) one who holds up the train of a gown or robe on a ceremonial occasion | - |
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| trainee | (noun) someone who is being trained | - |
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| traineeship | (noun) financial aid that enables you to get trained for a specified job | - |
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| trainer | (noun) simulator consisting of a machine on the ground that simulates the conditions of flying a plane | Synonyms: flight simulator |
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| (noun) one who trains other persons or animals | - |
| training | (noun) activity leading to skilled behavior | Synonyms: grooming, preparation |
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| (noun) the result of good upbringing (especially knowledge of correct social behavior) | Synonyms: breeding, education |
| trainload | (noun) quantity that can be carried by a train | - |
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| trainman | (noun) an employee of a railroad | Synonyms: railroad man, railroader, railway man, railwayman |
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| trainmaster | (noun) a railroad employer who is in charge of a railway yard | Synonyms: train dispatcher, yardmaster |
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| trait | (noun) a distinguishing feature of your personal nature | - |
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| traitor | (noun) someone who betrays his country by committing treason | Synonyms: treasonist |
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| (noun) a person who says one thing and does another | Synonyms: betrayer, double-crosser, double-dealer, two-timer |
| traitorousness | (noun) disloyalty by virtue of subversive behavior | Synonyms: subversiveness, treason |
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| traitress | (noun) female traitor | - |
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