The Collaborative International Dictionary of English v.0.48:

Noncommissioned \Non`com*mis"sioned\, a.
   Not having a commission.
   [1913 Webster]

   Noncommissioned officer (Mil.), a subordinate officer not
      appointed by a commission from the chief executive or
      supreme authority of the State; but by the Secretary of
      War or by the commanding officer of the regiment.
      [1913 Webster]

WordNet (r) 3.0 (2006):

noncommissioned officer
    n 1: a military officer appointed from enlisted personnel [syn:
         noncommissioned officer, noncom, enlisted officer]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "noncommissioned officer":
   Big Brother, NCO, acting corporal, acting sergeant, auditor,
   boatswain, boss, buck private, centurion, chief,
   chief warrant officer, color sergeant, common soldier, comptroller,
   controller, corporal, enlisted man, first sergeant, floor manager,
   floorman, floorwalker, foreman, gaffer, ganger, havildar, head,
   headman, inspector, lance corporal, lance sergeant,
   master sergeant, mess sergeant, monitor, naik, noncom, overman,
   overseer, platoon sergeant, private, private first class, proctor,
   sarge, sergeant, sergeant first class, sergeant major, sirdar,
   slave driver, staff sergeant, straw boss, subforeman, super,
   superintendent, supervisor, surveyor, taskmaster,
   technical sergeant, top sergeant, topkick, visitor,
   warrant officer