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. Champion of England (or King's or Queen's Champion) a hereditary official at coronations.
[ ME f. OF f. med.L campio -onis fighter f. L campus field ]