Source : Webster's Revised Unabridged Dictionary (1913)

Commandant \Com`man*dant"\, n. [F., orig. p. pr. of commander.]
   A commander; the commanding officer of a place, or of a body
   of men; as, the commandant of a navy-yard.

Source : WordNet®

commandant
     n : an officer in command of a military unit [syn: {commanding
         officer}, {commander}]