noun, plural T’s or Ts, t’s or ts.

  1. the 20th letter of the English alphabet, a consonant.
  2. any spoken sound represented by the letter T or t, as in tub, but, or butter.
  3. something having the shape of a T.
  4. a written or printed representation of the letter T or t.
  5. a device, as a printer’s type, for reproducing the letter T or t.


  1. to a T, exactly; perfectly: That job would suit you to a T.Also to a tee.


  1. a random variable having Student’s t distribution.
  2. the statistic employed in Student’s t-test.

noun (sometimes lowercase)

  1. T-shirt.

  1. tera-.
  2. Electricity. tesla; teslas.
  3. Physics. temperature.


  1. the 20th in order or in a series, or, when I is omitted, the 19th.
  2. (sometimes lowercase) the medieval Roman numeral for 160.Compare Roman numerals.
  3. surface tension.
  4. Biochemistry.
    1. threonine.
    2. thymine.
  5. Photography. T number.
  6. Physics.
    1. tau lepton.
    2. time reversal.
  7. the launching time of a rocket or missile: T minus two.

  1. a shortened form of it, before or after a verb, as in ’twas, ’tis, do’t, see’t.

  1. Chemistry. tertiary.

  1. thyroxine.

  1. triiodothyronine.

  1. U.S. Military. (in designations of aircraft) trainer: T-11.

  1. in the time of.

  1. Football. tackle.
  2. taken from.
  3. tare.
  4. teaspoon; teaspoonful.
  5. temperature.
  6. tenor.
  7. Grammar. tense.
  8. territory.
  9. time.
  10. tome.
  11. ton.
  12. town.
  13. township.
  14. transit.
  15. transitive.
  16. troy.

  1. tablespoon; tablespoonful.
  2. Territory.
  3. Township.
  4. Tuesday.

  1. variant of -ed1 used in forming the past tense or past participle of certain verbs, usually occurring when the final consonant of the stem is voiceless, a lateral, or a nasal and there is internal vowel change in the root: slept; felt; dreamt.


  1. the 19th letter of the Greek alphabet (T, τ).
  2. the consonant sound represented by this letter.
  3. tav.
  4. Also tau·on [tou-on] /ˈtaʊ ɒn/. Physics. tau lepton.
  5. Also called tau protein. Biochemistry. a protein that is an important component of nerve cells, helping to maintain their function and structure: in the brain, distortions in the protein’s molecular shape is associated with the onset of Alzheimer’s disease.

noun plural t’s, T’s or 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
    1. something shaped like a T
    2. (in combination)a T-junction
  3. to a T in every detail; perfectlythe work suited her to a 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

  1. Thailand (international car registration)

abbreviation for

  1. trainer (aircraft)T-37

abbreviation for

  1. commerce tare
  2. teaspoon(ful)
  3. temperature
  4. music tempo
  5. tenor
  6. grammar tense
  7. ton(s)
  8. transitive

contraction of

  1. it


  1. the 19th letter in the Greek alphabet (Τ, τ), a consonant, transliterated as t

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 1690s, though the exact signification is uncertain, despite much speculation. The measuring tool called a T-square is recorded by that name from 1785. nineteenth letter of the Greek alphabet, from Hebrew taw, last letter of the Hebrew alphabet, literally “sign, mark.” abbr.

  1. temperature


  1. The 19th letter of the Greek alphabet.

  1. Abbreviation of temperature, tesla, thymine
  2. The symbol for the isotope tritium.

see dot the i’s and cross the t’s; to a T.

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