Usage History of 'retroactive'

The following chart shows how frequently 'retroactive' appeared in printed materials over time. For example, the word 'retroactive' occurred 6 times in books in 1600 and 28,047 times in 2008. From 1600 to 2008, the word 'retroactive' was used a total of 896,091 times in books scanned by Google. See Reference: Google Ngram project.

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