The Collaborative International Dictionary of English v.0.48:

Aristocratic \Ar`is*to*crat"ic\, Aristocratical
\Ar`is*to*crat"ic*al\, a. [Gr. ?: cf. F. aristocratique.]
   1. Of or pertaining to an aristocracy; consisting in, or
      favoring, a government of nobles, or principal men; as, an
      aristocratic constitution.
      [1913 Webster]

   2. Partaking of aristocracy; befitting aristocracy;
      characteristic of, or originating with, the aristocracy;
      as, an aristocratic measure; aristocratic pride or
      manners. -- Ar`is*to*crat"ic*al*ly, adv. --
      Ar`is*to*crat"ic*al*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

aristocratically
    adv 1: in an aristocratic manner; "they behaved
           aristocratically"