Usage History of 'vigorous'

The following chart shows how frequently 'vigorous' appeared in printed materials over time. For example, the word 'vigorous' occurred 2 times in books in 1507 and 452,299 times in 2008. From 1507 to 2008, the word 'vigorous' was used a total of 13,298,455 times in books scanned by Google. See Reference: Google Ngram project.

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