Usage History of 'keynote'

The following chart shows how frequently 'keynote' appeared in printed materials over time. For example, the word 'keynote' occurred 2 times in books in 1647 and 51,842 times in 2008. From 1647 to 2008, the word 'keynote' was used a total of 1,178,080 times in books scanned by Google. See Reference: Google Ngram project.

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