Usage History of 'dilation'

The following chart shows how frequently 'dilation' appeared in printed materials over time. For example, the word 'dilation' occurred 2 times in books in 1607 and 50,518 times in 2008. From 1607 to 2008, the word 'dilation' was used a total of 1,269,559 times in books scanned by Google. See Reference: Google Ngram project.

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