Usage History of 'penetrability'

The following chart shows how frequently 'penetrability' appeared in printed materials over time. For example, the word 'penetrability' occurred 6 times in books in 1694 and 1,868 times in 2008. From 1694 to 2008, the word 'penetrability' was used a total of 69,744 times in books scanned by Google. See Reference: Google Ngram project.

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