definition of
fighter

[1] #1 fighter n. [combatant, battler, belligerent, scrapper] someone who fights (or is fighting). wn

[2] #2 fighter n. [fighter aircraft, attack aircraft] a high-speed military or naval airplane designed to destroy enemy aircraft in the air. wn

[3] #3 fighter n. [champion, hero, paladin] someone who fights for a cause. wn