What does invalidation mean?
Invalidation is the formal process of making something invalid or officially unusable. It is used in legal and administrative contexts when a document, contract, permit, decision, or authorization is declared to have no force or effect. In technical settings, invalidation can mean marking data as unreliable, expired, corrupted, or otherwise unsuitable for further use. The related verb is “invalidate,” which means to make something invalid; “validation” is its opposite. Although the word sounds technical, it has a straightforward everyday logic: an authority, permission, or record that fails the required checks is no longer accepted. It is especially useful when describing the formal withdrawal or rejection of something that might otherwise appear legitimate.
The act of making something invalid, especially a legal or official document, decision, or authorization.
"The council is responsible for the invalidation of permits that fail to meet safety standards."
Usually formal; the wording often refers to an official procedure or determination.
The process of marking data, a record, or a session as invalid or unusable.
"Changing the password caused the automatic invalidation of all active sessions."
Common in computing, information systems, and technical documentation.
The plural is used when referring to multiple separate acts or instances of invalidation; it is less common than the singular abstract noun.
"The audit documented several invalidations of outdated access credentials."
Invalidation is the official undoing of a document, decision, or piece of data—turning a supposed authority into something officially unusable.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does invalidation come from?
Invalidation was formed in the early 19th century from the adjective “invalid” and the suffix “-ation.” The adjective comes from Latin invalidus, formed from validus, meaning “valid” or “strong,” together with the prefix in-, expressing negation. English later developed the related forms “validate” and “validity” from the same Latin root, while “invalid” preserves the negative form directly.
Related word forms
How invalidation is actually used
The word is formal and especially common in legal, regulatory, technical, and administrative contexts. In computing, it often describes deliberately marking cached or stored data as unusable.
Easily confused with invalidation
Invalidation is the process of declaring or making something invalid, whereas validation is the process of confirming that something is valid, acceptable, or properly documented.