sua sponte

Etymology
A borrowing of

Phrase

 * 1)  Without prompting or suggestion; on its own initiative.
 * 2) * 1878, "Decretals" in the Encyclopædia Britannica, 9th ed., Vol. VII, p. 22:
 * Decretals... ought, properly speaking, to be distinguished, on the one hand from constitutions... enacted by the Pope sua sponte without reference to any particular case, and on the other hand from rescripts... which apply only to special circumstances or individuals, and constitute no general precedent. But this nomenclature is not strictly observed.

Usage notes

 * Usually used when the court issues an order or otherwise acts without being petitioned to do so.