WorldAugust 19, 2026
indefeasible
in-di-FEE-zuh-buhl
Definition
In a legal context, an interest or right that cannot be annulled, made void, or taken away by a third party.
Etymology
Derived from the Old French 'indéfaisable', which combines the prefix 'in-' (not) with 'défaire' (to undo). The term has been used in legal English since the 16th century to describe titles or rights that remain fixed and permanent.
In the news
The article refers to 'indefeasible rights of use' (IRUs) concerning submarine cable infrastructure, meaning these are secure, permanent, and legally binding rights to use the cable capacity that cannot be easily invalidated.
Security of Critical Infrastructure: Tranche 2 reforms
Read the full article ↗Corrs Chambers Westgarth