\Sei"zin\, n. [F. saisine. See {Seize}.]
1. (Law) Possession; possession of an estate of froehold. It
   may be either in deed or in law; the former when there is
   actual possession, the latter when there is a right to
   such possession by construction of law. In some of the
   United States seizin means merely ownership. --Burrill.

2. The act of taking possession. [Obs.]

3. The thing possessed; property. --Sir M. Halle.

Note: Commonly spelt by writers on law seisin.

{Livery of seizin}. (Eng. Law) See Note under {Livery}, 1.