Definition from Wiktionary, the free dictionary
- A sport in which high-performance off-road motorcycles are raced on an artificially made dirt track consisting of steep jumps and obstacles.
2007 August 2, Matt Higgins, “Once Shunned, Freestylers to Meet Rivals”, New York Times:
- In a 10-year career, he has won more A.M.A. supercross and motocross races than any rider in history.