Usage History of 'undulations'

The following chart shows how frequently 'undulations' appeared in printed materials over time. For example, the word 'undulations' occurred 4 times in books in 1667 and 25,471 times in 2008. From 1667 to 2008, the word 'undulations' was used a total of 635,454 times in books scanned by Google. See Reference: Google Ngram project.

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