ex rel

ex rel.

conj. abbreviation for Latin ex relatione, meaning "upon being related" or "upon information," used in the title of a legal proceeding filed by a state attorney general (or the federal Department of Justice) on behalf of the government, on the instigation of a private person, who needs the state to enforce the rights of himself/herself and the public. For example, the caption would read: The State of Tennessee ex rel. Archie Johnson v. Hardy Products.