Usage History of 'undulation'

The following chart shows how frequently 'undulation' appeared in printed materials over time. For example, the word 'undulation' occurred 2 times in books in 1658 and 10,326 times in 2008. From 1658 to 2008, the word 'undulation' was used a total of 262,615 times in books scanned by Google. See Reference: Google Ngram project.

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