Usage History of 'etiology'

The following chart shows how frequently 'etiology' appeared in printed materials over time. For example, the word 'etiology' occurred 2 times in books in 1725 and 122,873 times in 2008. From 1725 to 2008, the word 'etiology' was used a total of 4,177,419 times in books scanned by Google. See Reference: Google Ngram project.

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