Usage History of 'delusion'

The following chart shows how frequently 'delusion' appeared in printed materials over time. For example, the word 'delusion' occurred 4 times in books in 1520 and 174,761 times in 2008. From 1520 to 2008, the word 'delusion' was used a total of 3,639,490 times in books scanned by Google. See Reference: Google Ngram project.

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