From The Collaborative International Dictionary of English v.0.48:

Mute Mute, n. 1. One who does not speak, whether from physical inability, unwillingness, or other cause. Specifically: (a) One who, from deafness, either congenital or from early life, is unable to use articulate language; a deaf-mute. (b) A person employed by undertakers at a funeral. (c) A person whose part in a play does not require him to speak. (d) Among the Turks, an officer or attendant who is selected for his place because he can not speak. [1913 Webster] 2. (Phon.) A letter which represents no sound; a silent letter; also, a close articulation; an element of speech formed by a position of the mouth organs which stops the passage of the breath; as, p, b, d, k, t. [1913 Webster] 3. (Mus.) A little utensil made of brass, ivory, or other material, so formed that it can be fixed in an erect position on the bridge of a violin, or similar instrument, in order to deaden or soften the tone. [1913 Webster]

From The Collaborative International Dictionary of English v.0.48:

T T (t[=e]), the twentieth letter of the English alphabet, is a nonvocal consonant. With the letter h it forms the digraph th, which has two distinct sounds, as in thin, then. See Guide to Pronunciation, [sect][sect]262-264, and also [sect][sect]153, 156, 169, 172, 176, 178-180. [1913 Webster] The letter derives its name and form from the Latin, the form of the Latin letter being further derived through the Greek from the Ph[oe]nician. The ultimate origin is probably Egyptian. It is etymologically most nearly related to d, s, th; as in tug, duke; two, dual, L. duo; resin, L. resina, Gr. "rhti`nh, tent, tense, a., tenuous, thin; nostril, thrill. See D, S. [1913 Webster] T bandage (Surg.), a bandage shaped like the letter T, and used principally for application to the groin, or perineum. T cart, a kind of fashionable two seated wagon for pleasure driving. T iron. (a) A rod with a short crosspiece at the end, -- used as a hook. (b) Iron in bars, having a cross section formed like the letter T, -- used in structures. T rail, a kind of rail for railroad tracks, having no flange at the bottom so that a section resembles the letter T. T square, a ruler having a crosspiece or head at one end, for the purpose of making parallel lines; -- so called from its shape. It is laid on a drawing board and guided by the crosspiece, which is pressed against the straight edge of the board. Sometimes the head is arranged to be set at different angles. To a T, exactly, perfectly; as, to suit to a T. [Colloq.] [1913 Webster]

From WordNet (r) 2.0:

T n 1: a base found in DNA (but not in RNA) and derived from pyrimidine; pairs with adenine [syn: thymine] 2: one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose) [syn: deoxythymidine monophosphate] 3: a unit of weight equivalent to 1000 kilograms [syn: metric ton, MT, tonne] 4: a unit of information equal to a trillion (1,099,511,627,776) bytes or 1024 gigabytes [syn: terabyte, TB] 5: the 20th letter of the Roman alphabet 6: thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer [syn: triiodothyronine, liothyronine] 7: hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells; "thyroxine is 65% iodine" [syn: thyroxine, thyroxin, tetraiodothyronine]

From Jargon File (4.3.1, 29 Jun 2001):

T /T/ 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)

From The Free On-line Dictionary of Computing (27 SEP 03):

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From The Free On-line Dictionary of Computing (27 SEP 03):

T 1. True. A Lisp compiler by Johnathan A. Rees in 1982 at Yale University. T has static scope and is a near-superset of Scheme. Unix source is available. T is written in itself and compiles to efficient native code. Used as the basis for the Yale Haskell system. Maintained by David Kranz <kranz@masala.lcs.mit.edu>. Current version: 3.1. (ftp://ftp.ai.mit.edu/pub/systems/t3.1). A multiprocessing version of T is available (ftp://masala.lcs.mit.edu/pub/mult). Runs on Decstation, SPARC, Sun-3, Vax under Unix, Encore, HP, Apollo, Macintosh under A/UX. E-mail: <t3-bugs@cs.yale.edu> (bugs). E-mail: <t-project@cs.yale.edu>. (1991-11-26) ["The T Manual", Johnathan A. Rees <jar@zurich.ai.mit.edu> et al, Yale U, 1984]. 2. A functional language. ["T: A Simple Reduction Language Based on Combinatory Term Rewriting", Ida et al, Proc of Prog Future Generation Computers, 1988]. 3. (lower case) The Lisp atom used to represent "true", among other things. "false" is represented using the same atom as an empty list, nil. This overloading of the basic constants of the language helps to make Lisp write-only code. 4. In transaction-processing circles, an abbreviation for "transaction". 5. (Purdue) An alternative spelling of "tee".