Usage History of 'unison'

The following chart shows how frequently 'unison' appeared in printed materials over time. For example, the word 'unison' occurred 2 times in books in 1575 and 113,876 times in 2008. From 1575 to 2008, the word 'unison' was used a total of 2,302,362 times in books scanned by Google. See Reference: Google Ngram project.

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