The Collaborative International Dictionary of English v.0.48:

Apt \Apt\, v. t. [L. aptare. See Aptate.]
   To fit; to suit; to adapt. [Obs.] " To apt their places."
   --B. Jonson.
   [1913 Webster]

         That our speech be apted to edification. --Jer. Taylor.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Apt \Apt\ ([a^]pt), 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.
      [1913 Webster]

            They have always apt instruments.     --Burke.
      [1913 Webster]

            A river . . . apt to be forded by a lamb. --Jer.
                                                  Taylor.
      [1913 Webster]

   2. Having an habitual tendency; habitually liable or likely;
      -- used of things.
      [1913 Webster]

            My vines and peaches . . . were apt to have a soot
            or smuttiness upon their leaves and fruit. --Temple.
      [1913 Webster]

            This tree, if unprotected, is apt to be stripped of
            the leaves by a leaf-cutting ant.     --Lubbock.
      [1913 Webster]

   3. Inclined; disposed customarily; given; ready; -- used of
      persons.
      [1913 Webster]

            Apter to give than thou wit be to ask. --Beau. & Fl.
      [1913 Webster]

            That lofty pity with which prosperous folk are apt
            to remember their grandfathers.       --F. Harrison.
      [1913 Webster]

   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.
      [1913 Webster]

            Live a thousand years,
            I shall not find myself so apt to die. --Shak.
      [1913 Webster]

            I find thee apt . . . Now, Hamlet, hear. --Shak.
      [1913 Webster]

   Syn: Fit; meet; suitable; qualified; inclined; disposed;
        liable; ready; quick; prompt.
        [1913 Webster]

WordNet (r) 3.0 (2006):

apt
    adj 1: (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)]
    2: 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)]
    3: mentally quick and resourceful; "an apt pupil"; "you are a
       clever man...you reason well and your wit is bold"-Bram
       Stoker [syn: apt, clever]
    4: being of striking appropriateness and pertinence; "the
       successful copywriter is a master of apposite and evocative
       verbal images"; "an apt reply" [syn: apposite, apt,
       pertinent]

Moby Thesaurus II by Grady Ward, 1.0:

171 Moby Thesaurus words for "apt":
   Daedalian, a propos, ad rem, adapted, adept, adroit, alert,
   applicable, apposite, appropriate, apropos, artistic,
   authoritative, becoming, befitting, bent, brainy, bravura, bright,
   brilliant, clean, clever, comely, compelling, convincing,
   coordinated, correct, crack, crackerjack, cunning, cute, daedal,
   decisive, deft, dexterous, dextrous, diplomatic, disposed,
   dispositioned, docile, dovetailing, educable, exact, excellent,
   expeditious, expert, facile, fair, fancy, felicitous, fit, fitted,
   fitting, foreseeable, formable, geared, gifted, given, good,
   goodish, graceful, handy, happy, hopeful, immediate,
   impressionable, in the cards, in the mood, inclined, ingenious,
   inspired, instant, instantaneous, instructable, intelligent, just,
   just right, keen, keen-witted, liable, likely, magisterial,
   malleable, masterful, masterly, meet, meshing, minded, moldable,
   motivated, neat, nice, nimble, nimble-witted, no dumbbell, no mean,
   not born yesterday, odds-on, on the button, opportune, pat,
   pertinent, plastic, pliable, politic, precise, predictable,
   predictable within limits, predisposed, presumable, presumptive,
   probable, professional, proficient, promising, prompt, prone,
   proper, punctual, qualified, quick, quick-thinking, quick-witted,
   quite some, ready, receptive, relevant, resourceful, right,
   ripe for instruction, schoolable, scintillating, seasonable,
   seemly, sharp, sharp-witted, skillful, slick, smart, some,
   sortable, speedy, statesmanlike, statistically probable,
   steel-trap, stylish, suitable, suited, suiting, summary,
   susceptible, swift, tactful, tailored, talented, teachable,
   telling, the compleat, the complete, thirsty for knowledge,
   to the point, to the purpose, trainable, verisimilar, virtuoso,
   well-chosen, well-done, well-expressed, well-put, willing,
   workmanlike



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

APT
       Address Pass Through


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

APT
       Advanced Package Tool (Linux, Debian)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

APT
       Advanced Photoscale Technology (Brother)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

APT
       Automatically Programmed Tools


The Free On-line Dictionary of Computing (30 December 2018):

APT

   1.  Automatically Programmed Tools.

   2.  Audio Processing Technology.