'Fighter' definitions:

Definition of 'fighter'

From: WordNet
noun
Someone who fights (or is fighting) [syn: combatant, battler, belligerent, fighter, scrapper]
noun
A high-speed military or naval airplane designed to destroy enemy aircraft in the air [syn: fighter, fighter aircraft, attack aircraft]
noun
Someone who fights for a cause [syn: champion, fighter, hero, paladin]

Definition of 'Fighter'

From: GCIDE
  • Fighter \Fight"er\ (f[imac]t"[~e]r), n. [AS. feohtere.]
  • 1. One who fights; a combatant; a warrior. --Shak. [1913 Webster]
  • 2. A boxer; a pugilist. [PJC]
  • 3. A person with the determination and will to persist through great difficulty to achieve a goal; one with the courage to fight and resist an opponent, and to struggle with all one's powers. [PJC]
  • 4. (Mil.) A military aircraft designed to seek out and destroy enemy aircraft; it is usually smaller and more maneuvarable than aircraft designed specifically for bombing. However, hybrid fighter-bomber aircraft that perform both functions also are used. [PJC]