Source : Webster's Revised Unabridged Dictionary (1913)

Autocrat \Au"to*crat\, n. [Gr. ?; ? self + ? strength, ? strong:
   cf. F. autocrate. See {Hard}, a.]
   1. An absolute sovereign; a monarch who holds and exercises
      the powers of government by claim of absolute right, not
      subject to restriction; as, Autocrat of all the Russias (a
      title of the Czar).

   2. One who rules with undisputed sway in any company or
      relation; a despot.

            The autocrat of the breakfast table.  --Holmes.

Source : WordNet®

autocrat
     n : a cruel and oppressive dictator [syn: {tyrant}, {despot}]