The Collaborative International Dictionary of English v.0.48:

Partiality \Par`ti*al"i*ty\ (?; 277), n. [Cf. F. partialit['e].]
   1. The quality or state of being partial; inclination to
      favor one party, or one side of a question, more than the
      other; undue bias of mind.
      [1913 Webster]

   2. A predilection or inclination to one thing rather than to
      others; special taste or liking; as, a partiality for
      poetry or painting. --Roget.
      [1913 Webster]

WordNet (r) 3.0 (2006):

partiality
    n 1: a predisposition to like something; "he had a fondness for
         whiskey" [syn: fondness, fancy, partiality]
    2: an inclination to favor one group or view or opinion over
       alternatives [syn: partiality, partisanship] [ant:
       impartiality, nonpartisanship]

Moby Thesaurus II by Grady Ward, 1.0:

76 Moby Thesaurus words for "partiality":
   affinity, appreciation, bag, bent, bias, chosen kind, clannishness,
   clanship, cliqueyness, cliquishness, cliquism, cup of tea,
   denominationalism, discrimination, druthers, esprit de corps,
   ethnocentricity, exclusiveness, eye, faction, factionalism, fancy,
   fascination, favor, favoritism, fetish, fondness, forejudgment,
   inclination, inclining, inequality, interest, involvement,
   jaundice, jaundiced eye, leaning, liking, love, mutual affinity,
   mutual attraction, nepotism, one-sidedness, parti pris, partialism,
   particular choice, partisanism, partisanship, party spirit,
   penchant, personal choice, preconception, predilection,
   predisposition, preference, preferential treatment, prejudgment,
   prejudice, prepossession, proclivity, propensity, relish,
   sectarianism, sectionalism, soft spot, style, sympathy, taste,
   tendency, thing, turn, twist, type, undetachment,
   undispassionateness, unneutrality, weakness