Usage History of 'challenged'

The following chart shows how frequently 'challenged' appeared in printed materials over time. For example, the word 'challenged' occurred 2 times in books in 1507 and 528,384 times in 2008. From 1507 to 2008, the word 'challenged' was used a total of 11,164,717 times in books scanned by Google. See Reference: Google Ngram project.

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