The Collaborative International Dictionary of English v.0.48:

Prejudice \Prej"u*dice\, n. [F. pr['e]judice, L. praejudicium;
   prae before + judicium judgment. See Prejudicate,
   Judicial.]
   1. Foresight. [Obs.]
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            Naught might hinder his quick prejudize. --Spenser.
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   2. An opinion or judgment formed without due examination;
      prejudgment; a leaning toward one side of a question from
      other considerations than those belonging to it; an
      unreasonable predilection for, or objection against,
      anything; especially, an opinion or leaning adverse to
      anything, without just grounds, or before sufficient
      knowledge.
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            Though often misled by prejudice and passion, he was
            emphatically an honest man.           --Macaulay.
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   3. (Law) A bias on the part of judge, juror, or witness which
      interferes with fairness of judgment.
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   4. Mischief; hurt; damage; injury; detriment. --Locke.
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            England and France might, through their amity,
            Breed him some prejudice.             --Shak.
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   Syn: Prejudgment; prepossession; bias; harm; hurt; damage;
        detriment; mischief; disadvantage.
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The Collaborative International Dictionary of English v.0.48:

Prejudice \Prej"u*dice\, v. t. [imp. & p. p. Prejudiced; p.
   pr. & vb. n. Prejudicing.] [Cf. F. pr['e]judicier. See
   Prejudice, n.]
   1. To cause to have prejudice; to prepossess with opinions
      formed without due knowledge or examination; to bias the
      mind of, by hasty and incorrect notions; to give an
      unreasonable bent to, as to one side or the other of a
      cause; as, to prejudice a critic or a juryman.
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            Suffer not any beloved study to prejudice your mind
            so far as to despise all other learning. --I. Watts
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   2. To obstruct or injure by prejudices, or by previous bias
      of the mind; hence, generally, to hurt; to damage; to
      injure; to impair; as, to prejudice a good cause.
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            Seek how may prejudice the foe.       --Shak
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WordNet (r) 3.0 (2006):

prejudice
    n 1: a partiality that prevents objective consideration of an
         issue or situation [syn: bias, prejudice,
         preconception]
    v 1: disadvantage by prejudice
    2: influence (somebody's) opinion in advance [syn: prejudice,
       prepossess]

Moby Thesaurus II by Grady Ward, 1.0:

169 Moby Thesaurus words for "prejudice":
   a thing for, abuse, affinity, afflict, aggrieve, angle, apartheid,
   aptitude, aptness, bag, befoul, bend, bent, bewitch, bias, bigotry,
   blemish, blight, cast, chosen kind, color, conatus, condemn,
   conduciveness, corrupt, cronyism, crucify, cup of tea, curse,
   damage, defile, delight, deprave, despoil, destroy, detriment,
   diathesis, disadvantage, discrimination, dispose, disposition,
   disserve, distort, distress, do a mischief, do evil, do ill,
   do wrong, do wrong by, doom, drawback, druthers, eagerness,
   envenom, fancy, favor, favoritism, feeling for, forejudgment,
   get into trouble, handicap, harass, harm, hex, hurt, impair,
   impairment, inclination, incline, inequality, infect, influence,
   injure, injury, intolerance, jaundice, jaundiced eye, jinx,
   leaning, liability, liking, loss, loss of ground, male chauvinism,
   maltreat, mar, menace, mischief, mistreat, molest, one-sidedness,
   outrage, parti pris, partialism, partiality, particular choice,
   partisanship, penchant, persecute, personal choice,
   play havoc with, play hob with, poison, pollute, preapprehension,
   preconception, preconclusion, preconsideration, predecision,
   predetermination, predilection, predispose, predisposition,
   preference, prejudge, prejudgment, prejudication,
   prejudice against, prejudice the issue, premature judgment,
   prenotion, prepossess, prepossession, presumption, presupposal,
   presupposition, presurmise, probability, proclivity, proneness,
   propensity, racialism, racism, readiness, savage, scathe,
   sensitivity to, sexism, skew, slant, soft spot, spoil,
   step backward, style, susceptibility, sway, taint, tarnish, taste,
   tendency, thing, threaten, torment, torture, tropism, turn, twist,
   type, undetachment, undispassionateness, unfairness, violate,
   vitiate, warp, weakness, willingness, wound, wreak havoc on,
   wrong



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

PREJUDICE. To decide beforehand; to lean in favor of one side of a cause for
some reason or other than its justice.
     2. A judge ought to be without prejudice, and he cannot therefore sit
in a case where he has any interest, or when a near relation is a part, or
where he has been of counsel for one of the parties. Vide Judge.
     3. In the civil law prejudice signifies a tort or injury; as the act of
one man should never prejudice another. Dig. 60, 17, 74.



The Devil's Dictionary (1881-1906):

PREJUDICE, n.  A vagrant opinion without visible means of support.