Source : Webster's Revised Unabridged Dictionary (1913)

Adjutant \Ad"ju*tant\, n. [L. adjutans, p. pr. of adjutare to
   help. See {Aid}.]
   1. A helper; an assistant.

   2. (Mil.) A regimental staff officer, who assists the
      colonel, or commanding officer of a garrison or regiment,
      in the details of regimental and garrison duty.

   {Adjutant general}
      (a) (Mil.), the principal staff officer of an army,
          through whom the commanding general receives
          communications and issues military orders. In the U.
          S. army he is brigadier general.
      (b) (Among the Jesuits), one of a select number of
          fathers, who resided with the general of the order,
          each of whom had a province or country assigned to his
          care.

   3. (Zo["o]l.) A species of very large stork ({Ciconia
      argala}), a native of India; -- called also the {gigantic
      crane}, and by the native name {argala}. It is noted for
      its serpent-destroying habits.

Source : WordNet®

adjutant general
     n : a general's adjutant; chief administrative officer