Usage History of 'impure'

The following chart shows how frequently 'impure' appeared in printed materials over time. For example, the word 'impure' occurred 2 times in books in 1563 and 91,958 times in 2008. From 1563 to 2008, the word 'impure' was used a total of 2,375,612 times in books scanned by Google. See Reference: Google Ngram project.

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