Source : Webster's Revised Unabridged Dictionary (1913)

Warrior \War"rior\ (?; 277), n. [OE. werreour, OF. werreour,
   guerreor, from guerre, werre, war. See {War}, and {Warray}.]
   A man engaged or experienced in war, or in the military life;
   a soldier; a champion.

         Warriors old with ordered spear and shield. --Milton.

   {Warrior ant} (Zo["o]l.), a reddish ant ({Formica sanguinea})
      native of Europe and America. It is one of the species
      which move in armies to capture and enslave other ants.

Source : WordNet®

warrior
     n : someone engaged in or experienced in warfare