Definition of "seisin"

seisin

noun
plural seisins
1. (law, historical) An entitlement to a freehold estate with a right to immediate possession; dates from feudal times but is still used in technical discussions of real property law today.
2. (obsolete) The act of taking possession.
3. (obsolete) The thing possessed; property.
  Quotations
  Diſſeiſin is a large Title, and is an unlawful Entry and Ouſter of him that has an actual Seiſin and Freehold.
  1713, [Matthew Hale], “[The Analysis of the Law: […].] Sect. XLIII. Concerning Wrongs which Carry with Them an Amotion of Possession.”, in The History and Analysis of the Common Law of England: […], [London]: […] J[ohn] Nutt, assignee of Edw[ard] Sayer Esq; for J. Walthoe, […], page 131