Usage History of 'efficacities'

The following chart shows how frequently 'efficacities' appeared in printed materials over time. For example, the word 'efficacities' occurred 2 times in books in 1938 and 2 times in 2007. From 1938 to 2007, the word 'efficacities' was used a total of 353 times in books scanned by Google. See Reference: Google Ngram project.

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