A feudal term for an entitlement to a freehold estate with a right to immediate possession; still used in technical discussions of real property law today
French scisin, to make to possess or to sit upon The possession of land under a claim, either express or implied by law, of an estate amounting at least to a freehold Towle v Ayer, 8 N H 59 (1835) See Seisina below Originally, seisin was the completion of the feudal investiture; it now means ownership A "covenant of seisin" and a "covenant of right to convey" are synonymous Cook v Hammond, 4 Mass 488 (1827)