1) French word used in English 1) Possession 
(sees-in) n. an old feudal term for having both possession and title of real property. The word is found in some old deeds, meaning ownership in fee simple (full title to real property).
Seisin (or seizin) is the legal possession of a feudal fiefdom (i.e., an estate in land). It was used in the form of `the son and heir of X has obtained seisin of his inheritance`, and thus is effectively a term concerned with conveyancing in the feudal era. In the feudal age, the king alone `owned` all the land of England by his allodial righ...
freehold possession of land in a feudal system
• (n.) See Seizin.
in English feudal society, a term that came to mean a type of possession that gained credibility with the passage of time. Seisin was not ownership ... [2 related articles]
(n) Seisin is defined as the stage of possessing a property specifically a landed property along with exclusive title to the property,
Sei'sin noun See Seizin . Spenser. 
See: seizin