Usage History of 'impassability'

The following chart shows how frequently 'impassability' appeared in printed materials over time. For example, the word 'impassability' occurred 2 times in books in 1793 and 479 times in 2008. From 1793 to 2008, the word 'impassability' was used a total of 7,715 times in books scanned by Google. See Reference: Google Ngram project.

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