Usage History of 'retrospection'

The following chart shows how frequently 'retrospection' appeared in printed materials over time. For example, the word 'retrospection' occurred 2 times in books in 1645 and 10,488 times in 2008. From 1645 to 2008, the word 'retrospection' was used a total of 209,310 times in books scanned by Google. See Reference: Google Ngram project.

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