Usage History of 'psychopathy'

The following chart shows how frequently 'psychopathy' appeared in printed materials over time. For example, the word 'psychopathy' occurred 6 times in books in 1798 and 23,965 times in 2008. From 1798 to 2008, the word 'psychopathy' was used a total of 287,075 times in books scanned by Google. See Reference: Google Ngram project.

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