Defeasance :: Defeasance (n.) 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..
Defeasanced :: Defeasanced (a.) Liable to defeasance; capable of being made void or forfeited.