Source : Webster's Revised Unabridged Dictionary (1913)

Paladin \Pal"a*din\, n. [F., fr.It. paladino, fr. L. palatinus
   an officer of the palace. See {Palatine}.]
   A knight-errant; a distinguished champion; as, the paladins
   of Charlemagne. --Sir W. Scott.

Source : WordNet®

paladin
     n : someone who fights for a cause [syn: {champion}, {fighter},
         {hero}]