Definition of Invalidation

Babylon English Dictionary
disqualification, act of making invalid
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Invalidation Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(n.)
The act of inavlidating, or the state of being invalidated.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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invalidation
\in*val`i*da"tion\ (?), n. the act of inavlidating, or the state of being invalidated. so many invalidations of their right.
invalidation
n : a formal termination (of a relationship or a judicial proceeding etc) [syn: annulment]



WordNet 2.0

Noun
1. (law) a formal termination (of a relationship or a judicial proceeding etc)
(synonym) annulment
(hypernym) dissolution, breakup
(hyponym) dissolution of marriage
(derivation) invalidate, annul, quash, void, avoid, nullify
(classification) law, jurisprudence