Usage History of 'vertically'

The following chart shows how frequently 'vertically' appeared in printed materials over time. For example, the word 'vertically' occurred 4 times in books in 1507 and 152,447 times in 2008. From 1507 to 2008, the word 'vertically' was used a total of 4,688,759 times in books scanned by Google. See Reference: Google Ngram project.

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