Ex Rel Law and Legal Definition
Ex rel. is an abbreviation that stands for "ex relatione". It is often used in a case caption's title after a party's name. The term ex relatione means "upon relation or information". Legal proceedings which are brought by the attorney general or state prosecutor in the name and behalf of the state, but based on the information and at the complaint of an individual who has a personal interest in the matter, are referred to as "on the relation" (ex relatione) of such person, who is called the relator.