Usage History of 'certify'

The following chart shows how frequently 'certify' appeared in printed materials over time. For example, the word 'certify' occurred 6 times in books in 1579 and 69,337 times in 2008. From 1579 to 2008, the word 'certify' was used a total of 1,846,026 times in books scanned by Google. See Reference: Google Ngram project.

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