Usage History of 'retrogrades'

The following chart shows how frequently 'retrogrades' appeared in printed materials over time. For example, the word 'retrogrades' occurred 1 time in books in 1679 and 1,679 times in 2008. From 1679 to 2008, the word 'retrogrades' was used a total of 26,974 times in books scanned by Google. See Reference: Google Ngram project.

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