Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of invalidation is as below...

Annulment :: Annulment (n.) The act of annulling; abolition; invalidation.

Invalidation :: Invalidation (n.) The act of inavlidating, or the state of being invalidated..

Vitiation :: Vitiation (n.) The act of vitiating, or the state of being vitiated; depravation; corruption; invalidation; as, the vitiation of the blood; the vitiation of a contract..

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