The Collaborative International Dictionary of English v.0.48:

Different \Dif"fer*ent\, a. [L. differens, -entis, p. pr. of
   differre: cf. F. diff['e]rent.]
   1. Distinct; separate; not the same; other. "Five different
      churches." --Addison.
      [1913 Webster]

   2. Of various or contrary nature, form, or quality; partially
      or totally unlike; dissimilar; as, different kinds of food
      or drink; different states of health; different shapes;
      different degrees of excellence.
      [1913 Webster]

            Men are as different from each other, as the regions
            in which they are born are different. --Dryden.
      [1913 Webster]

   Note: Different is properly followed by from. Different to,
         for different from, is a common English colloquialism.
         Different than is quite inadmissible.
         [1913 Webster]

WordNet (r) 3.0 (2006):

different
    adj 1: unlike in nature or quality or form or degree; "took
           different approaches to the problem"; "came to a
           different conclusion"; "different parts of the country";
           "on different sides of the issue"; "this meeting was
           different from the earlier one" [ant: same]
    2: distinctly separate from the first; "that's another (or
       different) issue altogether"
    3: differing from all others; not ordinary; "advertising that
       strives continually to be different"; "this new music is
       certainly different but I don't really like it"
    4: marked by dissimilarity; "for twins they are very unlike";
       "people are profoundly different" [syn: unlike,
       dissimilar, different] [ant: like, similar]
    5: distinct or separate; "each interviewed different members of
       the community"

Moby Thesaurus II by Grady Ward, 1.0:

198 Moby Thesaurus words for "different":
   aberrant, abnormal, absolute, abundant, amorphous, anomalistic,
   anomalous, another, assorted, at odds, at variance, bizarre,
   capricious, certain, changeable, changing, choppy, concrete,
   conflicting, contrary, contrasted, contrasting, contrastive,
   counter, crank, crankish, cranky, crotchety, defined, definite,
   departing, detailed, determinate, deviant, deviating, deviative,
   deviatory, differentiated, differing, disaccordant, disagreeing,
   discordant, discrepant, discrete, discriminated, disjoined,
   disorderly, disparate, dissimilar, dissonant, distant, distinct,
   distinctive, distinguishable, distinguished, divaricate, divergent,
   diverging, divers, diverse, diversified, diversiform, dotty,
   eccentric, erose, erratic, esoteric, especial, exceptional,
   express, extraordinary, fey, fixed, flaky, formless, freakish,
   funny, hardly like, heteroclite, heterogeneous, heteromorphic,
   idiocratic, idiosyncratic, impulsive, in disagreement, inaccordant,
   incompatible, incongruous, inconsistent, inconsonant, inconstant,
   individual, inharmonious, inner, intimate, irreconcilable,
   irregular, jagged, jerky, kinky, kooky, maggoty, manifold, many,
   mercurial, minute, motley, multifarious, mutable, new,
   nonconformist, nonstandard, nonuniform, noteworthy, novel,
   numerous, nutty, odd, oddball, off, offbeat, opposite, original,
   other, otherwise, out, particular, peculiar, personal, pluralistic,
   poles apart, poles asunder, precise, private, queer, quirky,
   ragged, rare, remarkable, respective, rough, scarcely like,
   screwball, screwy, separate, separated, several, shapeless, single,
   singular, solipsistic, spasmodic, special, specific, sporadic,
   strange, stray, straying, subnormal, sundry, twisted, unalike,
   uncommon, unconformable, unconventional, unequable, unequal,
   uneven, unfamiliar, unheard-of, unidentical, unique, unlike,
   unmatched, unnatural, unorthodox, unresembling, unsame, unsimilar,
   unstable, unsteady, unsystematic, ununiform, unusual, variable,
   variant, varied, variegated, variform, various, varying, wacky,
   wandering, wavering, weird, whimsical, widely apart,
   worlds apart