Source : Webster's Revised Unabridged Dictionary (1913)

Executor \Ex*ec"u*tor\, n. [L. executor, exsecutor: cf. F.
   ex['e]cuteur. Cf. {Executer}.]
   1. One who executes or performs; a doer; as, an executor of
      baseness. --Shak.

   2. An executioner. [Obs.]

            Delivering o'er to executors paw? The lazy, yawning
            drone.                                --Shak.

   3. (Law) The person appointed by a testator to execute his
      will, or to see its provisions carried into effect, after
      his decease.

   {Executor de son tort} [Of., executor of his own wrong]
      (Law), a stranger who intermeddles without authority in
      the distribution of the estate of a deceased person.

Source : WordNet®

executor
     n : a person appointed by a testator to carry out the terms of
         the will