Usage History of 'opacities'

The following chart shows how frequently 'opacities' appeared in printed materials over time. For example, the word 'opacities' occurred 2 times in books in 1659 and 8,643 times in 2008. From 1659 to 2008, the word 'opacities' was used a total of 407,656 times in books scanned by Google. See Reference: Google Ngram project.

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