Usage History of 'gradus'

The following chart shows how frequently 'gradus' appeared in printed materials over time. For example, the word 'gradus' occurred 14 times in books in 1507 and 3,845 times in 2008. From 1507 to 2008, the word 'gradus' was used a total of 121,521 times in books scanned by Google. See Reference: Google Ngram project.

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