Usage History of 'copulae'

The following chart shows how frequently 'copulae' appeared in printed materials over time. For example, the word 'copulae' occurred 2 times in books in 1782 and 321 times in 2008. From 1782 to 2008, the word 'copulae' was used a total of 6,592 times in books scanned by Google. See Reference: Google Ngram project.

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