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More fully "writ of (also †de) procedendo ad judicium". A writ authorizing or requiring a subordinate court to proceed to judgment.
Mid 17th century; earliest use found in William Prynne (1600–1669), pamphleteer and lawyer. From post-classical Latin procedendo ad judicium from classical Latin prōcēdendō + ad to, towards + iūdicium judgement, sentence.