Usage History of 'rarefy'

The following chart shows how frequently 'rarefy' appeared in printed materials over time. For example, the word 'rarefy' occurred 4 times in books in 1687 and 844 times in 2008. From 1687 to 2008, the word 'rarefy' was used a total of 19,514 times in books scanned by Google. See Reference: Google Ngram project.

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