Usage History of 'alert'

The following chart shows how frequently 'alert' appeared in printed materials over time. For example, the word 'alert' occurred 5 times in books in 1524 and 465,027 times in 2008. From 1524 to 2008, the word 'alert' was used a total of 9,840,052 times in books scanned by Google. See Reference: Google Ngram project.

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