(law) An order regulating the practice of the courts, or an order made between parties to an action or a suit.
(mathematics) A determinate method prescribed for performing any operation and producing a certain result.
(printing, dated) A thin plate of brass or other metal, of the same height as the type, and used for printing lines, as between columns on the same page, or in tabular work.
Verb
(transitive) To regulate, be in charge of, make decisions for, reign over.