The Collaborative International Dictionary of English v.0.48:

Fix \Fix\, v. t. [imp. & p. p. Fixed (f[i^]kst); p. pr. & vb.
   n. Fixing.] [Cf. F. fixer.]
   1. To make firm, stable, or fast; to set or place
      permanently; to fasten immovably; to establish; to
      implant; to secure; to make definite.
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            An ass's nole I fixed on his head.    --Shak.
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            O, fix thy chair of grace, that all my powers
            May also fix their reverence.         --Herbert.
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            His heart is fixed, trusting in the Lord. --Ps.
                                                  cxii. 7.
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            And fix far deeper in his head their stings.
                                                  --Milton.
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   2. To hold steadily; to direct unwaveringly; to fasten, as
      the eye on an object, the attention on a speaker.
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            Sat fixed in thought the mighty Stagirite. --Pope.
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            One eye on death, and one full fix'd on heaven.
                                                  --Young.
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   3. To transfix; to pierce. [Obs.] --Sandys.
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   4. (Photog.) To render (an impression) permanent by treating
      with a developer to make it insensible to the action of
      light. --Abney.
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   5. To put in order; to arrange; to dispose of; to adjust; to
      set to rights; to set or place in the manner desired or
      most suitable; hence, to repair; as, to fix the clothes;
      to fix the furniture of a room. [Colloq. U.S.]
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   6. (Iron Manuf.) To line the hearth of (a puddling furnace)
      with fettling.

   Syn: To arrange; prepare; adjust; place; establish; settle;
        determine.
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The Collaborative International Dictionary of English v.0.48:

Fixed \Fixed\ (f[i^]kst), a.
   1. Securely placed or fastened; settled; established; firm;
      imovable; unalterable.
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   2. (Chem.) Stable; non-volatile.
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   Fixed air (Old Chem.), carbonic acid or carbon dioxide; --
      so called by Dr. Black because it can be absorbed or fixed
      by strong bases. See Carbonic acid, under Carbonic.

   Fixed alkali (Old Chem.), a non-volatile base, as soda, or
      potash, in distinction from the volatile alkali ammonia.


   Fixed ammunition (Mil.), a projectile and powder inclosed
      together in a case ready for loading.

   Fixed battery (Mil.), a battery which contains heavy guns
      and mortars intended to remain stationary; --
      distinguished from movable battery.

   Fixed bodies, those which can not be volatilized or
      separated by a common menstruum, without great difficulty,
      as gold, platinum, lime, etc.

   Fixed capital. See the Note under Capital, n., 4.

   Fixed fact, a well established fact. [Colloq.]

   Fixed light, one which emits constant beams; --
      distinguished from a flashing, revolving, or intermittent
      light.

   Fixed oils (Chem.), non-volatile, oily substances, as
      stearine and olein, which leave a permanent greasy stain,
      and which can not be distilled unchanged; -- distinguished
      from volatile or essential oils.

   Fixed pivot (Mil.), the fixed point about which any line of
      troops wheels.

   Fixed stars (Astron.), such stars as always retain nearly
      the same apparent position and distance with respect to
      each other, thus distinguished from planets and comets.
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WordNet (r) 3.0 (2006):

fixed
    adj 1: (of a number) having a fixed and unchanging value
    2: fixed and unmoving; "with eyes set in a fixed glassy stare";
       "his bearded face already has a set hollow look"- Connor
       Cruise O'Brien; "a face rigid with pain" [syn: fixed,
       set, rigid]
    3: securely placed or fastened or set; "a fixed piece of wood";
       "a fixed resistor" [ant: unfixed]
    4: incapable of being changed or moved or undone; e.g. "frozen
       prices"; "living on fixed incomes" [syn: fixed, frozen]

Moby Thesaurus II by Grady Ward, 1.0:

432 Moby Thesaurus words for "fixed":
   abiding, absolute, acknowledged, admitted, admitting no exception,
   agreed, aground, aligned, all up with, all-out, anchored, arranged,
   arrayed, arrested, ascertained, assigned, assorted, assured,
   at a standstill, at anchor, attached, attested, authenticated,
   beat, beaten, bent, bested, bonded, borne out, categorical,
   categorized, caught, cemented, certain, certified, chained,
   changeless, charmed, chronic, circumscribed, circumscript,
   circumstantiated, classified, clear, close, complete, composed,
   concentrated, conclusive, concrete, conditional, confirmed,
   confounded, constant, constituted, continuing, conventional,
   cooked-up, corroborated, crooked, customary, cut out,
   cut-and-dried, cut-and-dry, dead-still, decided, decisive,
   deep-dyed, deep-fixed, deep-rooted, deep-seated, deep-set,
   deep-settled, defeated, defined, definite, definitive, delimited,
   demarcated, demonstrated, deployed, detailed, determinate,
   determined, different, discomfited, dishonest, disposed, distinct,
   distinguished, done for, done in, down, downright, durable,
   dyed-in-the-wool, embosomed, emplaced, enchanted, encircled,
   enduring, ensconced, enthralled, entire, esoteric, especial,
   established, exceptional, exclusive, explicit, express,
   extraordinary, fallen, fascinated, fast, fastened, final, firm,
   flat, flat-out, flinty, floored, folk, framed, frozen, given,
   global, glued, graded, gripped, grouped, guaranteed, habitual,
   hallowed, handed down, harmonized, hedged about, held, heroic,
   high and dry, hoary, hors de combat, hypnotized, idle, immemorial,
   immobile, immotile, immotive, immovable, immutable, impacted,
   implanted, implicit, in apple-pie order, in commission,
   in condition, in fine fettle, in good condition, in good form,
   in good shape, in good trim, in kilter, in order, in repair,
   in shape, in the bag, in the pink, in trim, in working order,
   inalterable, inappealable, incorrigible, inculcated, indisputable,
   individual, inextricable, infixed, inflexible, ingrained, inner,
   installed, instilled, intact, intent, intimate, invariable,
   inveterate, inviolate, irremovable, irreversible, jammed,
   lambasted, lasting, lathered, legendary, licked, limited, located,
   long-established, long-standing, loyal, made sure, marshaled,
   mesmerized, methodized, minute, moored, motionless, moveless,
   mythological, nailed down, narrow, never-failing, normalized,
   noteworthy, obstinate, of long standing, of the folk, on ice,
   on the skids, open-and-shut, oral, ordered, orderly, organized,
   out of commission, out-and-out, outdone, outright, overborne,
   overcome, overmastered, overmatched, overpowered, overridden,
   overthrown, overturned, overwhelmed, packed, panicked, particular,
   peremptory, perfect, permanent, perpetual, persistent, personal,
   placed, planned, planted, plotted, positioned, positive, posted,
   prearranged, precise, preconcerted, precontrived, premeditated,
   preordered, prescriptive, private, proved, proven, provisional,
   provisory, put to rout, put-up, quiescent, ranged, ranked, rapt,
   received, recognized, regular, regularized, regulated, remaining,
   resolute, resolved, respective, restricted, riding at anchor,
   rigged, rigid, riveted, rooted, round, routed, routinized, ruined,
   scattered, schemed, seated, secure, secured, set, set-up, settled,
   settled in habit, several, shown, silenced, singular, situate,
   situated, skinned, skinned alive, solid, solipsistic, sorted, sot,
   special, specific, specificative, specified, spellbound, spotted,
   stable, stacked, stampeded, standardized, staple, stated, static,
   stationary, stationed, statuelike, staunch, staying, steadfast,
   steady, steely, still, stipulated, stipulatory, stock-still,
   straight, straight-out, stranded, stubborn, stuck, stuck fast,
   substantiated, surrounded, sustained, synchronized, systematized,
   taped, tenacious, tested, tethered, thorough, tied, tight,
   time-honored, to rights, torpid, total, traditional, transfixed,
   tried, tried and true, trimmed, trounced, true, true-blue,
   unalterable, unaltered, unbending, unblinking, unchangeable,
   unchanged, unchanging, unchecked, uncircumscribed, unconditional,
   unconditioned, undeflectable, understood, undestroyed, undeviating,
   undistracted, undivided, undone, undoubting, unemployed,
   unequivocal, unfading, unfailing, unfaltering, unflagging,
   unflappable, unflinching, unhampered, unhesitating, unlimited,
   unmistakable, unmitigated, unmodifiable, unmovable, unmoved,
   unmoving, unqualified, unquestioning, unreserved, unrestricted,
   unshaken, unshifting, unswerving, unvaried, unvarying, unwaivable,
   unwavering, unwritten, unyielding, up to scratch, up to snuff,
   upset, utter, validated, venerable, verified, warranted, wedged,
   whelmed, whipped, whole, without exception, without reserve,
   worshipful, worsted