A person who has defeated or surpassed all rivals in a competition, especially in sports.
My ambition is to be world champion.
Serena Williams is widely regarded as a tennis champion, having won numerous Grand Slam titles.
The boxer trained rigorously to become a world champion in his weight class.
The soccer team celebrated their victory, hoisting their captain as the undisputed champion of the tournament.
The Olympic champion proudly stood on the podium, draped in the gold medal he had earned through years of dedication and hard work.
