Defeasible

Defeasible may refer to:


 * Defeasibility (linguistics), the ability of an implicature or presupposition to be cancelled
 * Defeasible reasoning, a type of convincing but not demonstrative philosophical reasoning
 * Defeasible logic, a non-monotonic logic to formalize defeasible reasoning
 * Defeasible estate, an estate created when a grantor transfers land conditionally