Usage History of 'sigmoidal'

The following chart shows how frequently 'sigmoidal' appeared in printed materials over time. For example, the word 'sigmoidal' occurred 6 times in books in 1742 and 4,439 times in 2008. From 1742 to 2008, the word 'sigmoidal' was used a total of 130,885 times in books scanned by Google. See Reference: Google Ngram project.

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