Usage History of 'investigates'

The following chart shows how frequently 'investigates' appeared in printed materials over time. For example, the word 'investigates' occurred 2 times in books in 1677 and 52,182 times in 2008. From 1677 to 2008, the word 'investigates' was used a total of 1,080,751 times in books scanned by Google. See Reference: Google Ngram project.

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