Definitions
1.NounOne who challenges."challengers of traditional attitudes; The champion hopes to defeat his new challenger in the game to remain undefeated.; One child stood as king of the hill, and tried to withstand the pushes and shoves of his challengers."
2.NounOne who confronts or opposes; a confronter, an opposer."challengers of traditional attitudes"
3.NounOne who plays against the current champion of a contest or game in hopes of winning and becoming the new champion."The champion hopes to defeat his new challenger in the game to remain undefeated.; One child stood as king of the hill, and tried to withstand the pushes and shoves of his challengers."
4.NounOne who brings a legal claim; a claimant, a plaintiff; also, one who accuses; an accuser.
5.NounOften in the form Challenger: a match, tournament, or tour of the second-highest tier organized by the Association of Tennis Professionals.