Usage History of 'prewarning'

The following chart shows how frequently 'prewarning' appeared in printed materials over time. For example, the word 'prewarning' occurred 2 times in books in 1733 and 175 times in 2008. From 1733 to 2008, the word 'prewarning' was used a total of 2,268 times in books scanned by Google. See Reference: Google Ngram project.

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