The noun champion has 4 senses (first 2 from tagged texts)
1. (14) champion, champ, title-holder -- (someone who has won first place in a competition)
2. (1) champion, fighter, hero, paladin -- (someone who fights for a cause)
3. supporter, protagonist, champion, admirer, booster, friend -- (a person who backs a politician or a team etc.; "all their supporters came out for the game"; "they are friends of the library")
4. ace, adept, champion, sensation, maven, mavin, virtuoso, genius, hotshot, star, superstar, whiz, whizz, wizard, wiz -- (someone who is dazzlingly skilled in any field)
Overview of verb champion
The verb champion has 1 sense (first 1 from tagged texts)
1. (1) champion, defend -- (protect or fight for as a champion)
Overview of adj champion
The adj champion has 1 sense (no senses from tagged texts)
1. champion, prizewinning -- (holding first place in a contest; "a champion show dog"; "a prizewinning wine")