Pronunciation: ( jim-kä'nu),[key] —n. 1. a field day held for equestrians, consisting of exhibitions of horsemanship and much pageantry.
2. Also called autocross. a competition in which sports cars are timed as they travel on a closed, twisting course that requires much maneuvering.
3. any of various other sporting events, as a gymnastics exhibition or surfing contest.
4. a place where any such event is held.