Usage History of 'doctor'

The following chart shows how frequently 'doctor' appeared in printed materials over time. For example, the word 'doctor' occurred 4 times in books in 1515 and 2,766,354 times in 2008. From 1515 to 2008, the word 'doctor' was used a total of 52,105,594 times in books scanned by Google. See Reference: Google Ngram project.

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