noun
An ongoing winner in a game or contest.
Someone who is chosen to represent a group of people in a contest.
Someone who fights for a cause or status.
Someone who fights on another's behalf.
(botany) A particularly notable member of a plant species, such as one of great size.
adjective
(attributive) Acting as a champion; having defeated all one's competitors.
(attributive) Excellent; beyond compare.
(predicative, Ireland, British, dialect) Excellent; brilliant; superb; deserving of high praise.
verb
(transitive) To promote, advocate, or act as a champion for (a cause, etc.).
(obsolete, transitive) To challenge.