The Collaborative International Dictionary of English v.0.48:

Condescension \Con`de*scen"sion\, n. [L. condescensio.]
   The act of condescending; voluntary descent from one's rank
   or dignity in intercourse with an inferior; courtesy toward
   inferiors.
   [1913 Webster]

         It forbids pride . . . and commands humility, modesty,
         and condescension to others.             --Tillotson.
   [1913 Webster]

         Such a dignity and condescension . . . as are suitable
         to a superior nature.                    --Addison.

   Syn: Complaisance; courtesy; affability.
        [1913 Webster]

WordNet (r) 3.0 (2006):

condescension
    n 1: the trait of displaying arrogance by patronizing those
         considered inferior [syn: condescension,
         superciliousness, disdainfulness]
    2: a communication that indicates lack of respect by patronizing
       the recipient [syn: condescension, disdain, patronage]
    3: affability to your inferiors and temporary disregard for
       differences of position or rank; "the queen's condescension
       was intended to make us feel comfortable" [syn:
       condescension, condescendingness]

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "condescension":
   Olympian detachment, Olympian loftiness, arrogance, arrogantness,
   assumption of superiority, condescendence, deigning, domineering,
   domineeringness, haughtiness, haughty airs, hauteur, high horse,
   hoity-toitiness, hoity-toity, loftiness, overbearing pride,
   overbearingness, overweening pride, patronization, patronizing,
   patronizing attitude, pride, proudness, purse-pride, side,
   stiff-necked pride, superbia, toploftiness, uppishness,
   uppityness