Source : Webster's Revised Unabridged Dictionary (1913)

Aristocracy \Ar`is*toc"ra*cy\, n.; pl. {Aristocracies}. [Gr. ?;
   ? best + ? to be strong, to rule, ? strength; ? is perh. from
   the same root as E. arm, and orig. meant fitting: cf. F.
   aristocratie. See {Arm}, and {Create}, which is related to
   Gr. ?.]
   1. Government by the best citizens.

   2. A ruling body composed of the best citizens. [Obs.]

            In the Senate Right not our quest in this, I will
            protest them To all the world, no aristocracy. --B.
                                                  Jonson.

   3. A form a government, in which the supreme power is vested
      in the principal persons of a state, or in a privileged
      order; an oligarchy.

            The aristocracy of Venice hath admitted so many
            abuses, trough the degeneracy of the nobles, that
            the period of its duration seems approach. --Swift.

   4. The nobles or chief persons in a state; a privileged class
      or patrician order; (in a popular use) those who are
      regarded as superior to the rest of the community, as in
      rank, fortune, or intellect.