What is the meaning of champion?

noun

• Someone who has won first place in a competition.
  • synonyms: champ, title-holder
• Someone who fights for a cause.
  • synonyms: fighter, hero, paladin
• A person who backs a politician or a team etc..
  • usage: "all their supporters came out for the game"; "they are friends of the library"
  • synonyms: supporter, protagonist, admirer, booster, friend
• Someone who is dazzlingly skilled in any field.
  • synonyms: ace, adept, sensation, maven, mavin, virtuoso, genius, hotshot, star, superstar, whiz, whizz, wizard, wiz

verb

• Protect or fight for as a champion.
  • synonyms: defend

adjective

• Holding first place in a contest.
  • usage: "a champion show dog"; "a prizewinning wine"
  • synonyms: prizewinning