Usage History of 'invalidations'

The following chart shows how frequently 'invalidations' appeared in printed materials over time. For example, the word 'invalidations' occurred 2 times in books in 1803 and 241 times in 2008. From 1803 to 2008, the word 'invalidations' was used a total of 13,988 times in books scanned by Google. See Reference: Google Ngram project.

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