Source : Webster's Revised Unabridged Dictionary (1913)

Apt \Apt\, a. [F. apte, L. aptus, fr. obsolete apere to fasten,
   to join, to fit, akin to apisci to reach, attain: cf. Gr. ?
   to fasten, Skr. [=a]pta fit, fr. [=a]p to reach attain.]
   1. Fit or fitted; suited; suitable; appropriate.

            They have always apt instruments.     --Burke.

            A river . . . apt to be forded by a lamb. --Jer.
                                                  Taylor.

   2. Having an habitual tendency; habitually liable or likely;
      -- used of things.

            My vines and peaches . . . were apt to have a soot
            or smuttiness upon their leaves and fruit. --Temple.

            This tree, if unprotected, is apt to be stripped of
            the leaves by a leaf-cutting ant.     --Lubbock.

   3. Inclined; disposed customarily; given; ready; -- used of
      persons.

            Apter to give than thou wit be to ask. --Beau. & Fl.

            That lofty pity with which prosperous folk are apt
            to remember their grandfathers.       --F. Harrison.

   4. Ready; especially fitted or qualified (to do something);
      quick to learn; prompt; expert; as, a pupil apt to learn;
      an apt scholar. ``An apt wit.'' --Johnson.

            Live a thousand years, I shall not find myself so
            apt to die.                           --Shak.

            I find thee apt . . . Now, Hamlet, hear. --Shak.

   Syn: Fit; meet; suitable; qualified; inclined; disposed;
        liable; ready; quick; prompt.

Apt \Apt\, v. t. [L. aptare. See {Aptate}.]
   To fit; to suit; to adapt. [Obs.] `` To apt their places.''
   --B. Jonson.

         That our speech be apted to edification. --Jer. Taylor.

Source : WordNet®

apt
     adj 1: at risk of or subject to experiencing something usually
            unpleasant; "he is apt to lose"; "she is liable to
            forget" [syn: {apt(p)}, {liable(p)}]
     2: mentally quick and resourceful; "an apt pupil"; "you are a
        clever man...you reason well and your wit is bold"-Bram
        Stoker [syn: {clever}]
     3: (usually followed by `to') naturally disposed toward; "he is
        apt to ignore matters he considers unimportant"; "I am not
        minded to answer any questions" [syn: {apt(p)}, {disposed(p)},
         {given(p)}, {minded(p)}, {tending(p)}]
     4: being of striking appropriateness and pertinence; "the
        successful copywriter is a master of apposite and
        evocative verbal images"; "an apt reply" [syn: {apposite},
         {appropriate}, {pertinent}]

Source : Free On-Line Dictionary of Computing

APT
     
        1.  {Automatically Programmed Tools}.
     
        2.  {Audio Processing Technology}.
     
        (1996-01-15)