Usage History of 'copulatives'

The following chart shows how frequently 'copulatives' appeared in printed materials over time. For example, the word 'copulatives' occurred 2 times in books in 1676 and 335 times in 2008. From 1676 to 2008, the word 'copulatives' was used a total of 10,944 times in books scanned by Google. See Reference: Google Ngram project.

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