Usage History of 'progressions'

The following chart shows how frequently 'progressions' appeared in printed materials over time. For example, the word 'progressions' occurred 2 times in books in 1638 and 17,796 times in 2008. From 1638 to 2008, the word 'progressions' was used a total of 508,046 times in books scanned by Google. See Reference: Google Ngram project.

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