Usage History of 'key'

The following chart shows how frequently 'key' appeared in printed materials over time. For example, the word 'key' occurred 2 times in books in 1505 and 4,561,768 times in 2008. From 1505 to 2008, the word 'key' was used a total of 83,508,548 times in books scanned by Google. See Reference: Google Ngram project.

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