Supplemental Jurisdiction Law and Legal Definition

Supplemental jurisdiction is the authority of the U.S. federal courts to hear additional claims substantially related to the original claim even though the court lacks the subject-matter jurisdiction to hear the additional claims independently. Since 1990, federal district courts have had supplemental jurisdiction which includes jurisdiction over both ancillary and pendent claims. The rules regarding supplemental jurisdiction are codified at 28 USCA § 1367.