T

1. (n) (informal, with the) The Massachusetts Bay Transportation Authority, or MBTA; specifically, the subway or train. 2. (n) (informal, with the) The roughly T-shaped rural part of Pennsylvania, located between Philadelphia and Pittsburgh. 3. (n) (stock ticker symbol) AT&T. 4. (n) Abbreviation of time. [(uncountable) The inevitable progression into the future with the passing of present and past events.] 5. (n) Alternative letter-case form of T, ton. [(stock ticker symbol) AT&T.] 6. (n) (UK) Alternative letter-case form of T, tonne. [(stock ticker symbol) AT&T.] 7. (n) (historical) Abbreviation of tomin. [(historical) A traditional Spanish unit of mass, equivalent to about 0.6 g.] 8. (adj) (ratings) Abbreviation of teen. [Of or having to do with teenagers; teenage] 9. (adj) (finance) Abbreviation of taxable. [That can be taxed.] 10. (adj) (American Library Association) Abbreviation of twentieth, a book size range (12.5–15 cm in height). [The ordinal form of the number twenty.] 11. (adj) Abbreviation of transgender or transsexual. 12. (n) (clothing, informal) Ellipsis of T-shirt. [(clothing) A lightweight shirt without buttons, usually with short sleeves and no collar. Often made of cotton and frequently bears a picture or slogan.] 13. (n) Abbreviation of Tuesday. [The third day of the week in many religious traditions, and the second day of the week in systems that use the ISO 8601 norm; it follows Monday and precedes Wednesday.] 14. (n) Abbreviation of Thursday. [The fifth day of the week in many religious traditions, and the fourth day of the week in systems using the ISO 8601 norm; it follows Wednesday and precedes Friday.] 15. (n) (music) Abbreviation of tenor. [(music) A musical range or section higher than bass and lower than alto.] 16. (n) (automotive) Ellipsis of Model T. [The first car made by the Ford Motor Company on an assembly line. Before the Model T, cars were mostly made painstakingly by hand. The Model T helped popularize automobiling for the masses; it is widely considered the model that most did so.] 17. (n) (rail transport, in multiple unit formations) Abbreviation of trailer (“trailer car”). [Someone who or something that trails (follows behind); something that is trailing.] 18. (n) (sports) Abbreviation of ties (statistic). [(dated) Low shoes fastened with lacings.] 19. (n) (basketball) Abbreviation of technical foul. [(basketball) Any infraction of the rules penalized as a foul which does not involve physical contact during the course of play between players on the court, or is a foul by a nonplayer.] 20. (n) (especially LGBTQ) Abbreviation of testosterone. [(biochemistry, steroids) A steroid hormone that stimulates development of male secondary sexual characteristics, produced mainly in the testes, but also in the ovaries and adrenal cortex.] 21. (n) (medicine) Ellipsis of T wave. [(medicine, cardiology) A wave on an electrocardiogram that represents the electrical changes generated by the repolarization of the ventricles.] 22. (n) (immunology) Ellipsis of T cell. [(immunology) A lymphocyte, from the thymus, that can recognise specific antigens and can activate or deactivate other immune cells.] 23. (n) (construction) Ellipsis of T-beam. [(construction, mechanical engineering) A structural member with a cross section shaped like the letter T.] 24. (n) (nautical, historical) Abbreviation of temperance, marked in the ship's books when a sailor chose money instead of the daily rum ration. [Habitual moderation in regard to the indulgence of the natural appetites and passions; restrained or moderate indulgence.]