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Potentially subject to defeat, termination, or Annulment upon 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.

West's Encyclopedia of American Law, edition 2. Copyright 2008 The Gale Group, Inc. All rights reserved.


Collins Dictionary of Law © W.J. Stewart, 2006

DEFEASIBLE. What may be undone or annulled.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
He shows that the belief in the identity of matter is not a defeasibly justifying belief.
We are saying, instead, that pain is defeasibly bad-making; it has a default negative valence.[21] Where lying and pain lack this valence, as they sometimes or even often do, it is because they occupy a context defective by morality's own lights, or again because the cases in question are operating as variations that cannot be understood except by reference to a paradigm that carries the privileged valence.
First, it seems to fail to appreciate the full effect of a defeasibly structured accommodation of plural values.
Bonevac claims that a defender of supervenience can invoke the plausibility of "faint-hearted conditionals" or "principles of defeasibly sufficient reason" to support supervenience claims.
So it is indeed possible to represent lemmas in Default Logic, not as facts (as required by cumulativity) but rather as defaults, which appears more natural anyway, since it highlights the nature of a lemma as having been proven defeasibly and thus as being open to disputation.
One comes away from these discussions feeling both that Swanton's own insights have been trapped in her efforts to unify so many disparate phenomena, and, more significantly, that one is likely to attain a deeper account of freedom (along with important connections among apparently diverse phenomena) by assuming (defeasibly) that normative notions of freedom are fundamentally distinct from nonnormative conceptions, however they may be related.
As a result, when we encounter new beliefs that are formed in these ways, we can defeasibly discredit them even before investigating their truth.
When such standards are satisfied, that will then suffice, other things being equal, (defeasibly) to justify the claim that the content in question is true.
14) Haack acknowledges that there are many versions of foundationalism, including weak foundationalism which holds that basic beliefs are justified merely prima facie but defeasibly, to some degree but not completely, by something other than a belief" (p.
According to weak moral foundationalism, an adequate understanding of P renders S defeasibly justified in believing P.