Русско-англо-русский юридический словарь

Judicial precedent is a legal case law establishing a principle or rule that a court or other judicial body may apply while deciding subsequent cases involving similar issues or facts. (uslegal.com)

Judicial precedent: A judgment of a court of law cited as an authority for deciding a similar set of facts; a case which serves as authority for the legal principle embodied in its decision. The common law has developed by broadening down from precedent to precedent. (northumbria.ac.uk)