The Collaborative International Dictionary of English v.0.48:

Disposition \Dis`po*si"tion\, n. [F. disposition, dispositio,
   fr. disponere to dispose; dis- + ponere to place. See
   Position, and cf. Dispone.]
   1. The act of disposing, arranging, ordering, regulating, or
      transferring; application; disposal; as, the disposition
      of a man's property by will.
      [1913 Webster]

            Who have received the law by the disposition of
            angels.                               --Acts vii.
                                                  53.
      [1913 Webster]

            The disposition of the work, to put all things in a
            beautiful order and harmony, that the whole may be
            of a piece.                           --Dryden.
      [1913 Webster]

   2. The state or the manner of being disposed or arranged;
      distribution; arrangement; order; as, the disposition of
      the trees in an orchard; the disposition of the several
      parts of an edifice.
      [1913 Webster]

   3. Tendency to any action or state resulting from natural
      constitution; nature; quality; as, a disposition in plants
      to grow in a direction upward; a disposition in bodies to
      putrefaction.
      [1913 Webster]

   4. Conscious inclination; propension or propensity.
      [1913 Webster]

            How stands your disposition to be married? --Shak.
      [1913 Webster]

   5. Natural or prevailing spirit, or temperament of mind,
      especially as shown in intercourse with one's fellow-men;
      temper of mind. "A man of turbulent disposition."
      --Hallam. "He is of a very melancholy disposition."
      --Shak.
      [1913 Webster]

            His disposition led him to do things agreeable to
            his quality and condition wherein God had placed
            him.                                  --Strype.
      [1913 Webster]

   6. Mood; humor.
      [1913 Webster]

            As I perchance hereafter shall think meet
            To put an antic disposition on.       --Shak.

   Syn: Disposal; adjustment; regulation; arrangement;
        distribution; order; method; adaptation; inclination;
        propensity; bestowment; alienation; character; temper;
        mood. -- Disposition, Character, Temper.
        Disposition is the natural humor of a person, the
        predominating quality of his character, the
        constitutional habit of his mind. Character is this
        disposition influenced by motive, training, and will.
        Temper is a quality of the fiber of character, and is
        displayed chiefly when the emotions, especially the
        passions, are aroused.
        [1913 Webster]

WordNet (r) 3.0 (2006):

disposition
    n 1: your usual mood; "he has a happy disposition" [syn:
         disposition, temperament]
    2: the act or means of getting rid of something [syn:
       disposal, disposition]
    3: an attitude of mind especially one that favors one
       alternative over others; "he had an inclination to give up
       too easily"; "a tendency to be too strict" [syn:
       inclination, disposition, tendency]
    4: a natural or acquired habit or characteristic tendency in a
       person or thing; "a swelling with a disposition to rupture"

Moby Thesaurus II by Grady Ward, 1.0:

369 Moby Thesaurus words for "disposition":
   a thing for, abalienation, abandonment, abjuration, administration,
   affinity, alienation, allocation, allotment, amortization,
   amortizement, animus, appetence, appetency, appetite,
   apportionment, approach, aptitude, aptness, arrangement, array,
   arraying, assignation, assignment, attack, attitude, authority,
   bargain and sale, barter, battle array, being, bent, bequeathal,
   bestowal, bias, blueprint, blueprinting, body-build, brand,
   calculation, cast, cession, character, characteristic,
   characteristics, charting, choice, civil government, claws,
   clearance, close formation, clutches, collation, collocation,
   command, command function, complexion, composition, conation,
   conatus, conception, concord, conduciveness, conferment, conferral,
   consignation, consignment, constituents, constitution, contrivance,
   control, controlling, conveyance, conveyancing, crasis, decision,
   decision-making, deeding, delight, deliverance, delivery, demise,
   deployment, deportation, deposit, deposition, design, desire,
   detachment, determination, device, dharma, diathesis, direction,
   disbursal, disbursement, discard, discarding, discipline,
   discretion, disjunction, dispensation, dispersion, disposal,
   distribution, dole, doling, doling out, dominion, dumping,
   eagerness, eccentricity, echelon, ejection, elimination, empery,
   empire, emplacement, enfeoffment, enterprise, envisagement,
   eradication, ethos, exchange, executive function, exile,
   expatriation, expulsion, fancy, feeling for, fiber, figuring,
   foresight, forethought, forgoing, form, form of government,
   formation, formulation, forswearing, frame, frame of mind,
   free choice, free will, game, genius, getting rid of, giving,
   giving out, giving up, governance, government, grain, graphing,
   grip, ground plan, grouping, guidelines, habit, hand, hands,
   harmony, hue, humor, humors, idea, identity, idiosyncrasy, ilk,
   inclination, inclining, individualism, individuality, intention,
   iron hand, issuance, jettison, junking, jurisdiction, kidney, kind,
   lading, layout, leaning, lease and release, letting go, liability,
   liking, lineup, liquidation, loading, localization, locating,
   location, long-range plan, lust, make, makeup, management, mapping,
   marshaling, master plan, mental set, method, methodology, mettle,
   mind, mind-set, mold, mood, nature, objective, officiation,
   open order, operations research, order, order of battle, ordering,
   organization, ostracism, outlawing, outlawry, oversight, packing,
   passing around, passion, paying out, peace, penchant, personality,
   physique, pinpointing, placement, placing, plan, planning,
   planning function, pleasure, political organization, polity,
   positioning, posting, power, prearrangement, predilection,
   predisposition, prejudice, probability, procedure, proclivity,
   program, program of action, proneness, propensity, property,
   proportion, purge, putting, quality, quiet, quietude, raj,
   rationalization, readiness, recantation, reference, regime,
   regimen, regimentation, regnancy, regularity, regulation, reign,
   release, relegation, relinquishment, removal, renunciation,
   reposition, resignation, resolution, retraction, riddance, routine,
   rule, sacrifice, sale, schedule, schema, schematism,
   schematization, scheme, scheme of arrangement, scrapping,
   sensitivity to, sequence, set, settlement, settling, setup,
   severance, sexual desire, situation, slant, soft spot, somatotype,
   sort, sovereignty, spirit, spotting, stamp, stationing, storage,
   stowage, strain, strategic plan, strategy, streak, stripe,
   structure, structuring, suchness, supervision, surrender,
   susceptibility, suspension, sway, swearing off, symmetry, syntax,
   system, system of government, systematization, tactical plan,
   tactics, talons, temper, temperament, tendency, tenor,
   the big picture, the picture, tone, trading, tranquillity,
   transfer, transference, transmission, transmittal, tropism, turn,
   turn of mind, twist, type, uniformity, vein, velleity, vesting,
   volition, warp, way, weakness, will, will power, willingness, wish,
   withdrawal, working plan, yielding



Bouvier's Law Dictionary, Revised 6th Ed (1856):

DISPOSITION, French law. This word has several acceptations; sometimes it
signifies the effective marks of the will of some person; and at others the
instrument containing those marks.
     2. The dispositions of man make the dispositions of the law to cease;
for example, when a man bequeaths his estate, the disposition he makes of
it, renders the legal disposition of it, if he had died intestate, to cease.