One of the mysteries of the English language finally explained.
With reference to a court order, decree, etc.: such that a particular task or action must be performed. Later also occasionally (with reference to a legal action): in pursuit of a such an order. Now frequently in "order ad factum praestandum", "decree ad factum praestandum".
Late 17th century; earliest use found in George MacKenzie (?1638–1691), lawyer and politician. From post-classical Latin ad factum praestandum from classical Latin ad to + factum deed + praestandum, neuter gerundive of praestāre to present, show, to vouch for, take responsibility for.
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