Usage History of 'classes'

The following chart shows how frequently 'classes' appeared in printed materials over time. For example, the word 'classes' occurred 30 times in books in 1515 and 2,325,423 times in 2008. From 1515 to 2008, the word 'classes' was used a total of 65,297,543 times in books scanned by Google. See Reference: Google Ngram project.

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