Defeasance /(?)/

De·fea·sance

Defeasance

n.
  1. A defeat; an overthrow. [Obs.]
    After his foes' defeasance.
  2. A rendering null or void.
  3. A condition, relating to a deed, which being performed, the deed is defeated or rendered void; or a collateral deed, made at the same time with a feoffment, or other conveyance, containing conditions, on the performance of which the estate then created may be defeated. (Law)