Usage History of 'certification'

The following chart shows how frequently 'certification' appeared in printed materials over time. For example, the word 'certification' occurred 2 times in books in 1581 and 282,593 times in 2008. From 1581 to 2008, the word 'certification' was used a total of 5,584,010 times in books scanned by Google. See Reference: Google Ngram project.

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