Source : Webster's Revised Unabridged Dictionary (1913)

Arrogance \Ar"ro*gance\, n. [F., fr. L. arrogantia, fr.
   arrogans. See {Arrogant}.]
   The act or habit of arrogating, or making undue claims in an
   overbearing manner; that species of pride which consists in
   exorbitant claims of rank, dignity, estimation, or power, or
   which exalts the worth or importance of the person to an
   undue degree; proud contempt of others; lordliness;
   haughtiness; self-assumption; presumption.

         I hate not you for her proud arrogance.  --Shak.

   Syn: Haughtiness; hauteur; assumption; lordliness;
        presumption; pride; disdain; insolence; conceit;
        conceitedness. See {Haughtiness}.

Source : WordNet®

arrogance
     n : overbearing pride evidenced by a superior manner toward
         inferiors [syn: {haughtiness}, {hauteur}, {highhandedness},
          {lordliness}]