A champion is one that wins first place or first prize in a competition, or especially one who repeatedly wins first place or first prize in the same competition for many runnings of it.
A champion might also be one chosen to:
Finally, a champion can be any person who make an extraordinary effort, especially if that effort makes a difference between the success or failure of an endeavor by any group of which he is a part, or even the life or death of another person.
Synonyms: best, excellent
Antonyms: poorest, worst