What is Auxilium Curiae?

Legal Definition
In law, auxilium curiae signifies a court order for the summoning of one party at the suit of another.
-- Wikipedia
Legal Definition
In old English law. A precept or order of court citing and convening a party, at the suit and request of another, to warrant something.
-- Black's Law Dictionary
Legal Definition
A court order citing one at the suit of another to appear and warrant something.
-- Ballentine's Law Dictionary