Ex mero motu

EX MERO MOTU. Mere motion of a party's own free will. To prevent injustice, the courts will, ex mero motu, make rules and orders which the parties would not strictly be entitled to ask for.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
Where a petitioner fails to comply with the provisions of this rule, the Court may, ex mero motu or at the instance of any party dismiss such application."