n., v., adj., & adv.
--n.
1. (often attrib.) a person (esp. in a sport or game), an animal, plant, etc., that has defeated or surpassed all rivals in a competition etc.
2 a a person who fights or argues for a cause or on behalf of another person. b hist. a knight etc. who fought in single combat on behalf of a king etc.
--v.tr. support the cause of, defend, argue in favour of.
--adj. colloq. or dial. first-class, splendid.
--adv. colloq. or dial. splendidly, well.
Phrases and idioms:
Champion of England (or King's or Queen's Champion) a hereditary official at coronations.
Etymology: ME f. OF f. med.L campio -onis fighter f. L campus field