Definition of "invalidity" [in•va•lid•i•ty]

• The state of being invalid; lack of validity. (noun)

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• "Thirdly, claiming invalidity is not as easy as the Conservatives would have us believe, and implies that the medical profession are just giving sick notes away, willy-nilly."
• "He recommended that Marshoff obtain legal advice about ways to rectify the "invalidity" of her decision in the absence of the committee's advice."
• "A rare "invalidity" this -- a little confusing easy classifications."