Usage History of 'psychology'

The following chart shows how frequently 'psychology' appeared in printed materials over time. For example, the word 'psychology' occurred 2 times in books in 1505 and 1,689,553 times in 2008. From 1505 to 2008, the word 'psychology' was used a total of 44,591,634 times in books scanned by Google. See Reference: Google Ngram project.

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