Usage History of 'fortis'

The following chart shows how frequently 'fortis' appeared in printed materials over time. For example, the word 'fortis' occurred 2 times in books in 1625 and 7,026 times in 2008. From 1625 to 2008, the word 'fortis' was used a total of 190,710 times in books scanned by Google. See Reference: Google Ngram project.

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