Usage History of 'smoothing'

The following chart shows how frequently 'smoothing' appeared in printed materials over time. For example, the word 'smoothing' occurred 2 times in books in 1574 and 109,020 times in 2008. From 1574 to 2008, the word 'smoothing' was used a total of 2,253,603 times in books scanned by Google. See Reference: Google Ngram project.

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