Definition of defeasable in English:

defeasable

Pronunciation /dɪˈfiːzɪbl/

adjective

Law
  • Chiefly of a right or interest: that can be terminated or annulled in the event of a specified occurrence or the fulfilment of a specified condition.

Origin

Late Middle English. From Anglo-Norman defesable from de- + fesable that can be done, after defaire to undo.