Usage History of 'penetrated'

The following chart shows how frequently 'penetrated' appeared in printed materials over time. For example, the word 'penetrated' occurred 2 times in books in 1507 and 201,627 times in 2008. From 1507 to 2008, the word 'penetrated' was used a total of 5,337,478 times in books scanned by Google. See Reference: Google Ngram project.

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