Usage History of 'covaried'

The following chart shows how frequently 'covaried' appeared in printed materials over time. For example, the word 'covaried' occurred 6 times in books in 1948 and 597 times in 2008. From 1948 to 2008, the word 'covaried' was used a total of 16,342 times in books scanned by Google. See Reference: Google Ngram project.

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