What does invalidate mean?
Invalidate means to make something invalid: to cause a document, agreement, argument, theory, or set of results to lose its legal force, credibility, or usefulness. People may invalidate a contract because it was improperly signed, or invalidate a research finding after discovering a serious flaw in its method. The word is formal and appears frequently in legal, academic, scientific, and technical writing, where precision matters. Its force comes from the distinction between something that was once treated as reliable and something that can no longer be accepted as reliable. It is also related to valid, validate, and validity. Although invalidate can describe the loss of legal effect, it is broader than a purely legal process: a single result can be invalidated if it is based on faulty reasoning, inadequate evidence, or a flawed experiment. In general use, the verb often suggests that an objection has demonstrated a decisive weakness rather than merely expressing doubt.
verbTo make something invalid, especially by showing that it has no legal force, that its results are unsound, or that it cannot be relied upon.
- To render legally or formally void, such as a contract, signature, or authorization.
- To show that an argument, theory, test, or set of results is not sound or cannot be relied upon.
- To make a system, credential, or record no longer accepted or effective.
"The new evidence appeared to invalidate the study's central conclusion."
"A material clerical error can invalidate the entire agreement."
"Researchers repeated the experiment after discovering that a calibration fault might invalidate the results."
Invalidate is the verbal counterpart of invalid: it describes the moment when an argument, result, or legal claim loses its power to stand.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does invalidate come from?
The English verb invalidate was formed in the early 17th century by adding the verb-forming suffix -ate to invalid, a word borrowed from Latin. Latin invalidus was built from the prefix in-, meaning 'not', and validus, meaning 'valid' or 'strong'. The same Latin root also underlies cognates such as validate, validity, and valuable.
Related word forms
How invalidate is actually used
Formally used and especially common in legal, academic, scientific, and technical contexts. It is normally transitive, meaning that it acts on a claim, result, document, or authorization. The related adjective is invalid.
Easily confused with invalidate
Invalid is an adjective meaning not valid, while invalidate is a verb meaning to make something invalid.