The body of laws relating to the government of the armed forces rules and regulations for the conduct of military personnel. Military law the body of laws rules and regulations that have been developed to meet the needs of the military it encompasses service in the military the constitutional rights of service members the military criminal justice system and the international law of armed conflict. Legal definition of military law law enforced by military rather than civil authority specifically law prescribed by statute for the government of the armed forces and accompanying civilian employees. Noun 1 military law the body of laws and rules of conduct administered by military courts for the discipline trial and punishment of military personnel