Usage History of 'polytonally'

The following chart shows how frequently 'polytonally' appeared in printed materials over time. For example, the word 'polytonally' occurred 4 times in books in 1925 and 3 times in 2008. From 1925 to 2008, the word 'polytonally' was used a total of 402 times in books scanned by Google. See Reference: Google Ngram project.

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