Source : Webster's Revised Unabridged Dictionary (1913)

Administrator \Ad*min`is*tra"tor\, n. [L.]
   1. One who administers affairs; one who directs, manages,
      executes, or dispenses, whether in civil, judicial,
      political, or ecclesiastical affairs; a manager.

   2. (Law) A man who manages or settles the estate of an
      intestate, or of a testator when there is no competent
      executor; one to whom the right of administration has been
      committed by competent authority.

Source : WordNet®

administrator
     n 1: someone who administers a business [syn: {decision maker}]
     2: the party appointed by a probate court to distribute the
        estate of someone who dies without a will or without
        naming an executor
     3: someone who manages a government agency or department [syn:
        {executive}]