Usage History of 'gradient'

The following chart shows how frequently 'gradient' appeared in printed materials over time. For example, the word 'gradient' occurred 2 times in books in 1631 and 293,964 times in 2008. From 1631 to 2008, the word 'gradient' was used a total of 9,643,974 times in books scanned by Google. See Reference: Google Ngram project.

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