relator. 1. The real party in interest in whose name a state or an attorney general brings a
lawsuit. See EX REL. [Cases: Attorney General 9.C.J.S. Attorney General §§ 11, 15.] 2. The
applicant for a writ, esp. a writ of mandamus, prohibition, or quo warranto. [Cases: Mandamus
144; Prohibition 19; Quo Warranto 30. C.J.S. Mandamus §§ 278, 280, 287–288; Prohibition§§
10, 33; Quo Warranto§ 57.] 3. A person who furnishes information on which a civil or criminal
case is based; an informer. [Blacks Law 8th]