noun

1. An ongoing winner in a game or contest.

   “The defending champion is expected to defeat his challenger.”

2. Someone who is chosen to represent a group of people in a contest.

   “Barcelona is eligible to play in FIFA Club World Cup as the champion of Europe.”

3. Someone who fights for a cause or status.

   “champion of women's suffrage”

Synonyms: paladin

verb

1. To promote, advocate, or act as a champion for (a cause, etc.).

2. To challenge.

adjective

1. Acting as a champion; that has defeated all one's competitors.

2. Excellent; beyond compare.

3. (predicative) Excellent; brilliant; superb; deserving of high praise.

   “"That rollercoaster was champion," laughed Vinny.”