seisin

noun | play \ˈsēz-ᵊn\ | sei·sin

1. a : the possession of land arising from livery of seisin — see also livery of seisin

   b : the possession of a freehold estate in land by one having title thereto

2. : the right to immediate possession of an estate or to immediate succession seisin of an heir upon death of the testator