Rejoining voluntarily, or without being required to do so by a rule to rejoin. When a defendant waa under terms to rejoin gratis, he had to deliver a rejoinder, without putting the plaintiff to the necessity and expense of obtaining a rule to rejoin. 10 Mees. A W. 12; Lush, Pr. 396; Brown. Relatio est Actio juris et intenta ad unum. Relation is a fiction of law, and intended for one thing. 3 Coke, 28. Relatio semper flat et valeat dispositio. Reference should always be had in such a manner that a disposition in a will may avail. 6 Coke, 76.