Usage History of 'covertly'

The following chart shows how frequently 'covertly' appeared in printed materials over time. For example, the word 'covertly' occurred 2 times in books in 1524 and 32,373 times in 2008. From 1524 to 2008, the word 'covertly' was used a total of 693,493 times in books scanned by Google. See Reference: Google Ngram project.

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