1cham·pi·on 
/ˈtʃæmpijən/ noun
plural cham·pi·ons /ˈtʃæmpijən/ noun [count] 1 : someone or something (such as a team or an animal) that has won a contest or competition especially in sports
▪ tennis champions ▪ the heavyweight boxing champion of the world ▪ Our team will play the defending/reigning/current champions next week. ▪ the newly crowned national/world/Olympic champions — often used before another noun ▪ a champion boxer/skier/swimmer ▪ champion racehorses 2 : someone who fights or speaks publicly in support of a person, belief, cause, etc.
▪ He was a champion for the working classes. — often + of ▪ She was a lawyer and a champion of children's rights.
▪ tennis champions ▪ the heavyweight boxing champion of the world ▪ Our team will play the defending/reigning/current champions next week. ▪ the newly crowned national/world/Olympic champions — often used before another noun ▪ a champion boxer/skier/swimmer ▪ champion racehorses
▪ He was a champion for the working classes. — often + of ▪ She was a lawyer and a champion of children's rights.
