Русско-англо-русский юридический словарь

court of first instance 1. (Law) a court in which legal proceedings are begun or first heard (Collins English Dictionary)

A trial court or court of first instance is a court having original jurisdiction, in which trials take place. (Wikipedia)

Since 30 November in Greece, the payment of judicial stamp duty has been mandatory for declaratory actions brought before a Multi-Member Court of First Instance (Article 42 of Law 4640/2019). (European Parliament's website)

A trial court or court of first instance is a court having original jurisdiction, in which trials take place. (Wikipedia)