Usage History of 'vertical'

The following chart shows how frequently 'vertical' appeared in printed materials over time. For example, the word 'vertical' occurred 2 times in books in 1574 and 966,915 times in 2008. From 1574 to 2008, the word 'vertical' was used a total of 32,159,110 times in books scanned by Google. See Reference: Google Ngram project.

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