The Collaborative International Dictionary of English v.0.48:

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.
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   2. An executioner. [Obs.]
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            Delivering o'er to executors paw?
            The lazy, yawning drone.              --Shak.
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   3. (Law) The person appointed by a testator to execute his
      will, or to see its provisions carried into effect, after
      his decease.
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   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.
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WordNet (r) 3.0 (2006):

executor
    n 1: a person appointed by a testator to carry out the terms of
         the will