Definify.com
Webster 1913 Edition
Seizin
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.
☞ Commonly spelt by writers on law seisin.