de·fea·si·ble / diˈfēzəbəl/ • adj. chiefly Law Philos. open in principle to revision, valid objection, forfeiture, or annulment. DERIVATIVES: de·fea·si·bil·i·ty / -ˌfēzəˈbilitē/ n. de·fea·si·bly / -blē/ adv.
Potentially subject to defeat, termination, orannulmentupon the occurrence of a future action or event, or the performance of a condition subsequent.
The most common legal application of the term is with respect to estates as interest in land, such as in the case of a conveyance or a life estate, which is defeasible upon the happening of a certain specified event, for example, the death of the person holding such an interest.