Usage History of 'pervious'

The following chart shows how frequently 'pervious' appeared in printed materials over time. For example, the word 'pervious' occurred 2 times in books in 1657 and 6,787 times in 2008. From 1657 to 2008, the word 'pervious' was used a total of 193,640 times in books scanned by Google. See Reference: Google Ngram project.

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