The Collaborative International Dictionary of English v.0.48:

Part \Part\ (p[aum]rt), n. [F. part, L. pars, gen. partis; cf.
   parere to bring forth, produce. Cf. Parent, Depart,
   Parcel, Partner, Party, Portion.]
   1. One of the portions, equal or unequal, into which anything
      is divided, or regarded as divided; something less than a
      whole; a number, quantity, mass, or the like, regarded
      as going to make up, with others, a larger number,
      quantity, mass, etc., whether actually separate or not; a
      piece; a fragment; a fraction; a division; a member; a
      constituent.
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            And kept back part of the price, . . . and brought a
            certain part and laid it at the apostles'feet.
                                                  --Acts v. 2.
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            Our ideas of extension and number -- do they not
            contain a secret relation of the parts ? --Locke.
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            I am a part of all that I have met.   --Tennyson.
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   2. Hence, specifically:
      (a) An equal constituent portion; one of several or many
          like quantities, numbers, etc., into which anything is
          divided, or of which it is composed; proportional
          division or ingredient.
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                An homer is the tenth part of an ephah. --Ex.
                                                  xvi. 36.
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                A thought which, quartered, hath but one part
                wisdom,
                And ever three parts coward.      --Shak.
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      (b) A constituent portion of a living or spiritual whole;
          a member; an organ; an essential element.
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                All the parts were formed . . . into one
                harmonious body.                  --Locke.
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                The pulse, the glow of every part. --Keble.
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      (c) A constituent of character or capacity; quality;
          faculty; talent; -- usually in the plural with a
          collective sense. "Men of considerable parts."
          --Burke. "Great quickness of parts." --Macaulay.
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                Which maintained so politic a state of evil,
                that they will not admit any good part to
                intermingle with them.            --Shak.
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      (d) Quarter; region; district; -- usually in the plural.
          "The uttermost part of the heaven." --Neh. i. 9.
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                All parts resound with tumults, plaints, and
                fears.                            --Dryden.
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      (e) (Math.) Such portion of any quantity, as when taken a
          certain number of times, will exactly make that
          quantity; as, 3 is a part of 12; -- the opposite of
          multiple. Also, a line or other element of a
          geometrical figure.
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   3. That which belongs to one, or which is assumed by one, or
      which falls to one, in a division or apportionment; share;
      portion; lot; interest; concern; duty; office.
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            We have no part in David.             --2 Sam. xx.
                                                  1.
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            Accuse not Nature! she hath done her part;
            Do thou but thine.                    --Milton.
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            Let me bear
            My part of danger with an equal share. --Dryden.
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   4. Hence, specifically:
      (a) One of the opposing parties or sides in a conflict or
          a controversy; a faction.
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                For he that is not against us is on our part.
                                                  --Mark ix. 40.
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                Make whole kingdoms take her brother's part.
                                                  --Waller.
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      (b) A particular character in a drama or a play; an
          assumed personification; also, the language, actions,
          and influence of a character or an actor in a play;
          or, figuratively, in real life; as, to play the part
          of Macbeth. See To act a part, under Act.
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                That part
                Was aptly fitted and naturally performed.
                                                  --Shak.
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                It was a brute part of him to kill so capital a
                calf.                             --Shak.
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                Honor and shame from no condition rise;
                Act well your part, there all the honor lies.
                                                  --Pope.
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      (c) (Mus.) One of the different melodies of a concerted
          composition, which heard in union compose its harmony;
          also, the music for each voice or instrument; as, the
          treble, tenor, or bass part; the violin part, etc.
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   For my part, so far as concerns me; for my share.

   For the most part. See under Most, a.

   In good part, as well done; favorably; acceptably; in a
      friendly manner; as, to take an act in good part.
      --Hooker.

   In ill part, unfavorably; with displeasure.

   In part, in some degree; partly.

   Part and parcel, an essential or constituent portion; -- a
      reduplicative phrase. Cf. might and main, kith and
      kin, etc. "She was . . . part and parcel of the race and
      place." --Howitt.

   Part of speech (Gram.), a sort or class of words of a
      particular character; thus, the noun is a part of speech
      denoting the name of a thing; the verb is a part of speech
      which asserts something of the subject of a sentence.

   Part owner (Law), one of several owners or tenants in
      common. See Joint tenant, under Joint.

   Part singing, singing in which two or more of the harmonic
      parts are taken.

   Part song, a song in two or more (commonly four) distinct
      vocal parts. "A part song differs from a madrigal in its
      exclusion of contrapuntual devices; from a glee, in its
      being sung by many voices, instead of by one only, to each
      part." --Stainer & Barrett.
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   Syn: Portion; section; division; fraction; fragment; piece;
        share; constituent. See Portion, and Section.
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The Collaborative International Dictionary of English v.0.48:

Part \Part\ (p[aum]rt), v. t. [imp. & p. p. Parted; p. pr. &
   vb. n. Parting.] [F. partir, L. partire, partiri, p. p.
   partitus, fr. pars, gen. partis, a part. See Part, n.]
   [1913 Webster]
   1. To divide; to separate into distinct parts; to break into
      two or more parts or pieces; to sever. "Thou shalt part it
      in pieces." --Lev. ii. 6.
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            There, [celestial love] parted into rainbow hues.
                                                  --Keble.
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   2. To divide into shares; to divide and distribute; to allot;
      to apportion; to share.
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            To part his throne, and share his heaven with thee.
                                                  --Pope.
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            They parted my raiment among them.    --John xix.
                                                  24.
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   3. To separate or disunite; to cause to go apart; to remove
      from contact or contiguity; to sunder.
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            The Lord do so to me, and more also, if aught but
            death part thee and me.               --Ruth i. 17.
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            While he blessed them, he was parted from them, and
            carried up into heaven.               --Luke xxiv.
                                                  51.
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            The narrow seas that part
            The French and English.               --Shak.
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   4. Hence: To hold apart; to stand between; to intervene
      betwixt, as combatants.
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            The stumbling night did part our weary powers.
                                                  --Shak.
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   5. To separate by a process of extraction, elimination, or
      secretion; as, to part gold from silver.
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            The liver minds his own affair, . . .
            And parts and strains the vital juices. --Prior.
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   6. To leave; to quit. [Obs.]
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            Since presently your souls must part your bodies.
                                                  --Shak.
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   7. To separate (a collection of objects) into smaller
      collections; as, to part one's hair in the middle.
      [PJC]

   To part a cable (Naut.), to break it.

   To part company, to separate, as travelers or companions.
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The Collaborative International Dictionary of English v.0.48:

Part \Part\, v. i.
   1. To be broken or divided into parts or pieces; to break; to
      become separated; to go asunder; as, rope parts; his hair
      parts in the middle.
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   2. To go away; to depart; to take leave; to quit each other;
      hence, to die; -- often with from.
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            He wrung Bassanio's hand, and so they parted.
                                                  --Shak.
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            He owned that he had parted from the duke only a few
            hours before.                         --Macaulay.
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            His precious bag, which he would by no means part
            from.                                 --G. Eliot.
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   3. To perform an act of parting; to relinquish a connection
      of any kind; -- followed by with or from; as, to part with
      one's money.
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            Celia, for thy sake, I part
            With all that grew so near my heart.  --Waller.
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            Powerful hands . . . will not part
            Easily from possession won with arms. --Milton.
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            It was strange to him that a father should feel no
            tenderness at parting with an only son. --A.
                                                  Trollope.
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   4. To have a part or share; to partake. [Obs.] "They shall
      part alike." --1 Sam. xxx. 24.
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The Collaborative International Dictionary of English v.0.48:

Part \Part\, adv.
   Partly; in a measure. [R.] --Shak.
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WordNet (r) 3.0 (2006):

part
    adv 1: in part; in some degree; not wholly; "I felt partly to
           blame"; "He was partially paralyzed" [syn: partially,
           partly, part] [ant: all, altogether,
           completely, entirely, totally, whole, wholly]
    n 1: something determined in relation to something that includes
         it; "he wanted to feel a part of something bigger than
         himself"; "I read a portion of the manuscript"; "the
         smaller component is hard to reach"; "the animal
         constituent of plankton" [syn: part, portion,
         component part, component, constituent]
    2: something less than the whole of a human artifact; "the rear
       part of the house"; "glue the two parts together" [syn:
       part, portion]
    3: a portion of a natural object; "they analyzed the river into
       three parts"; "he needed a piece of granite" [syn: part,
       piece]
    4: that which concerns a person with regard to a particular role
       or situation; "it requires vigilance on our part"; "they
       resisted every effort on his part"
    5: the extended spatial location of something; "the farming
       regions of France"; "religions in all parts of the world";
       "regions of outer space" [syn: region, part]
    6: the actions and activities assigned to or required or
       expected of a person or group; "the function of a teacher";
       "the government must do its part"; "play its role" [syn:
       function, office, part, role]
    7: an actor's portrayal of someone in a play; "she played the
       part of Desdemona" [syn: character, role, theatrical
       role, part, persona]
    8: assets belonging to or due to or contributed by an individual
       person or group; "he wanted his share in cash" [syn: share,
       portion, part, percentage]
    9: one of the portions into which something is regarded as
       divided and which together constitute a whole; "the written
       part of the exam"; "the finance section of the company"; "the
       BBC's engineering division" [syn: part, section,
       division]
    10: a line of scalp that can be seen when sections of hair are
        combed in opposite directions; "his part was right in the
        middle" [syn: part, parting]
    11: the melody carried by a particular voice or instrument in
        polyphonic music; "he tried to sing the tenor part" [syn:
        part, voice]
    12: the part played by a person in bringing about a result; "I
        am proud of my contribution in advancing the project"; "they
        all did their share of the work" [syn: contribution,
        part, share]
    v 1: go one's own way; move apart; "The friends separated after
         the party" [syn: separate, part, split]
    2: discontinue an association or relation; go different ways;
       "The business partners broke over a tax question"; "The
       couple separated after 25 years of marriage"; "My friend and
       I split up" [syn: separate, part, split up, split,
       break, break up]
    3: leave; "The family took off for Florida" [syn: depart,
       part, start, start out, set forth, set off, set
       out, take off]
    4: come apart; "The two pieces that we had glued separated"
       [syn: separate, divide, part]
    5: force, take, or pull apart; "He separated the fighting
       children"; "Moses parted the Red Sea" [syn: separate,
       disunite, divide, part]

Moby Thesaurus II by Grady Ward, 1.0:

568 Moby Thesaurus words for "part":
   abrupt, absolute interest, accompaniment, actor, adjunct,
   after a fashion, airspace, alienate, allotment, allowance, alto,
   amount, anacrusis, antagonist, antihero, apportion, appreciably,
   appurtenance, area, arrangement, arrested, article, as for,
   as regards, aspect, at any rate, at best, at least, at most,
   at the least, at the most, at the outside, at worst, baritone,
   bass, bass passage, basso continuo, basso ostinato, bassus, batch,
   be lost, behalf, belt, benefit, big end, bigger half, bit,
   bit part, bite, bolt, book, bourdon, break up, bridge, broach,
   budget, bunch, burden, business, by, by and large, cadence, callow,
   canto, cantus, cantus figuratus, cantus planus, capacity, carve,
   carve up, cast, cast off, cast out, cause, cease to be,
   cease to live, census, chapter, character, chiefly, chink, chorus,
   chunk, circumstance, claim, clause, cleave, clutch, coda, coil,
   column, commission, common, comparatively, component, composition,
   condition, confines, constituent, constituents, content, contents,
   continental shelf, contingent, contingent interest, continuo,
   contralto, contribute to, copy, corner, corridor, count, country,
   crack, crevasse, cue, cut, cut adrift, cut off, cut open, cut out,
   cut up, deactivate, deal, debrief, decease, defective, deficient,
   delete, demob, demobilize, depart, depart this life, department,
   descant, destiny, detach, detail, detectably, development, die,
   disarticulate, disband, discharge, disconnect, disengage,
   disintegrate, disjoin, disjoint, dismiss, disorganize, dispart,
   dispel, disperse, dissociate, dissolve, district, disunite,
   divaricate, diverge, divide, divide into shares, divide up,
   divide with, dividend, division, divisions, divorce, divvy up,
   dole, dose, draft, drone, duty, easement, edition, eject, element,
   elements, embryonic, end, environs, equal share,
   equitable interest, equity, essentially, estate, estrange, expel,
   expire, exposition, faction, factor, failing, fairly, fall,
   fall asleep, fascicle, fat part, fate, feature, feeder, figure,
   figured bass, fissure, fixings, fly open, folderol, forgo, forsake,
   fractional, fragment, fragmentary, function, generally, give up,
   go, go away, go off, go out, go separate ways, gob,
   grant a divorce, grant an annulment, ground, ground bass, group,
   guts, half, halfway, halver, harmonic close, heap, heartland,
   heavy, helping, hero, heroine, hinterland, holding, hunk, hymnal,
   hymnbook, hypoplastic, immature, in a manner, in a way, in arrear,
   in arrears, in default, in part, in short supply, in some measure,
   in support of, in the main, inadequate, incise, incomplete,
   incompletely, index, infant, influence, ingenue, ingredient,
   ingredients, innards, insides, installment, instrumental score,
   integrant, interest, interlude, intermezzo, interspace, interval,
   introductory phrase, inventory, involvement, isolate, item, items,
   job, join in, keep apart, lacking, land, large amount, lay open,
   lead, lead role, leading lady, leading man, leading woman,
   leastwise, leave, let go, libretto, limitation, limited, line,
   lines, list, livraison, lot, lute tablature, mainly, make a space,
   makings, measure, meed, merely, mess, mildly, milieu, missing,
   moderately, modestly, modicum, moiety, mostly, movement, music,
   music paper, music roll, musical notation, musical phrase,
   musical score, musical sentence, muster out, needing, neighborhood,
   not comprehensively, not exhaustively, notation, number,
   obtain a divorce, office, offshore rights, on the whole,
   one-and-a-half, only, ope, open, open up, opera, opera score,
   orchestral score, ornament, pack, paragraph, parcel,
   part and parcel, part company, part with, partake of, partial,
   partially, participate in, participation, partition, partly, parts,
   party, pass, pass away, pass on, pass over, passage, patchy,
   percentage, period, perish, person, personage, phrase, piano score,
   piece, place, plain chant, plain song, portion, position,
   precincts, premises, prick song, principally, pro tanto,
   proportion, protagonist, province, pull apart, pull away,
   pull back, pull out, purely, purlieus, put apart, put asunder,
   put away, put off mortality, quality, quantity, quantum, quarter,
   quit this world, quota, rake-off, ration, refrain, region,
   relation, relatively, release, relinquish, remove, renounce, rent,
   resolution, response, responsibility, return to dust, rift, right,
   right of entry, rip, ritornello, rive, role, roll, run, sacrifice,
   salient, say, scant, scanty, scatter, score, scrap, scrappy,
   section, sectional, segment, segmental, segmentary, segregate,
   separate, sequester, serial, set apart, set aside,
   set at intervals, settlement, shard, share, share out, share with,
   sheet music, short, short score, shut off, shy, side, simply,
   sketchy, slice, slice the pie, slice up, slit, small amount,
   small share, so far, soil, some, somewhat, songbook, songster,
   soprano, soubrette, space, space out, specialty, split, split up,
   spread, spread out, spring open, stake, stand aloof, stand apart,
   stand aside, stanza, statement, status, step aside, stock,
   stop breathing, straight part, strain, strict settlement, strip,
   subtract, succumb, sue for divorce, sum, supporting character,
   supporting role, surrender, swing open, tablature, tailpiece, tap,
   tear, tear open, tenor, terrain, territory, text, thorough bass,
   three-mile limit, throw off, throw open, throw out, thus far,
   title, title role, to a degree, to some degree, to some extent,
   tolerably, transcript, transcription, treble, trust, tutti,
   tutti passage, twelve-mile limit, uncouple, underdeveloped,
   undersong, undeveloped, unit, unmarry, untie the knot, unyoke,
   up and die, use, usually, variation, verse, version,
   vested interest, vicinage, vicinity, villain, visibly, vocal score,
   voice, voice part, volume, walk-on, walking part, wanting, whole,
   withdraw, written music, yield, yield the ghost, zone