California Code, Business and Professions Code - BPC § 18625

(a) As described in the specific provisions of the act, whether referring to a professional or amateur contest or match, the terms “contest” and “match” are synonymous, may be used interchangeably, include boxing, kickboxing, and martial arts exhibitions, and mean a fight, prizefight, boxing contest, pugilistic contest, kickboxing contest, martial arts contest, or sparring match, between two or more persons, where full contact is used or intended that may result or is intended to result in physical harm to the opponent.