T, t

noun, plural T's or Ts, t's or ts.
the 20th letter of the English alphabet, a consonant.
any spoken sound represented by the letter T or t, as in tub, but, or butter.
something having the shape of a T .
a written or printed representation of the letter T or t.
a device, as a printer's type, for reproducing the letter T or t.
to a T, exactly; perfectly: That job would suit you to a T. Also, to a tee.
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noun (sometimes lowercase)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
t or T (tiː)
n , pl t's, T's, Ts
1.  the 20th letter and 16th consonant of the modern English alphabet
2.  a speech sound represented by this letter, usually a voiceless alveolar stop, as in tame
3.  a.  something shaped like a T
 b.  (in combination): a T-junction
4.  to a T in every detail; perfectly: the work suited her to a T
T or T

symbol for
1.  tonne(s)
2.  troy (weight)
3.  statistics distribution
4.  statistics See Student's t

symbol for
1.  absolute temperature
2.  tera-
3.  chem tritium
4.  biochem thymine
5.  tesla
6.  surface tension
abbreviation for
7.  Thailand (international car registration)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

to cross one's T's (and dot one's i's) "to be exact" is attested from 1849. Phrase to a T "exactly" is recorded from 1693, though the exact signification is uncertain, despite much speculation. The measuring tool called a T-square is recorded by that name from 1785.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

t abbr.
temperature (often italic)

T 1

The symbol for the isotope tritium.

T 2

  1. tablespoon

  2. absolute temperature (often italic)

  3. tesla

  4. tetanus toxoids vaccine

  5. tetanus vaccine

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
  1. Abbreviation of temperature, tesla, thymine

  2. The symbol for the isotope tritium.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Slang Dictionary


1. [from LISP terminology for `true'] Yes. Used in reply to a question (particularly one asked using The -P convention). In LISP, the constant T means `true', among other things. Some Lisp hackers use `T' and `NIL' instead of `Yes' and `No' almost reflexively. This sometimes causes misunderstandings. When a waiter or flight attendant asks whether a hacker wants coffee, he may absently respond `T', meaning that he wants coffee; but of course he will be brought a cup of tea instead. Fortunately, most hackers (particularly those who frequent Chinese restaurants) like tea at least as well as coffee -- so it is not that big a problem.
2. See time T (also since time T equals minus infinity).
3. [techspeak] In transaction-processing circles, an abbreviation for the noun `transaction'.
4. [Purdue] Alternate spelling of tee.
5. A dialect of LISP developed at Yale. (There is an intended allusion to NIL, "New Implementation of Lisp", another dialect of Lisp developed for the VAX)
American Heritage
Abbreviations & Acronyms
  1. tense (grammar)

  2. [long] ton

  3. top quark

  1. AT&T Corporation (stock symbol)

  2. temperature

  3. tenor

  4. tesla

  5. Thailand (international vehicle ID)

  6. thunderstorms

  7. Thursday

  8. thymine

  9. time reversal

  10. [United States] Treasury

  11. tritium

  12. true

  13. T-shirt

  14. Tuesday

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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