In law, legal principles derived from usage and custom, or from court decisions affirming such usages and customs, or the acts of Parliament in force at the time of the American Revolution, as distinguished from law created by enactment of American legislation.
Law which has been created by the courts, through decisions of judges, rather than by the legislature (statutory law).
A system of law based on custom or precedent, not on legislation. It is law that evolves from the judiciary branch of the government through court decisions. It is the most frequent source of legal precedent for malpractice cases.