Usage History of 'permeable'

The following chart shows how frequently 'permeable' appeared in printed materials over time. For example, the word 'permeable' occurred 4 times in books in 1658 and 48,361 times in 2008. From 1658 to 2008, the word 'permeable' was used a total of 1,523,314 times in books scanned by Google. See Reference: Google Ngram project.

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