Usage History of 'rarefied'

The following chart shows how frequently 'rarefied' appeared in printed materials over time. For example, the word 'rarefied' occurred 2 times in books in 1598 and 19,318 times in 2008. From 1598 to 2008, the word 'rarefied' was used a total of 614,874 times in books scanned by Google. See Reference: Google Ngram project.

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