Usage History of 'mortarboard'

The following chart shows how frequently 'mortarboard' appeared in printed materials over time. For example, the word 'mortarboard' occurred 2 times in books in 1873 and 659 times in 2008. From 1873 to 2008, the word 'mortarboard' was used a total of 17,896 times in books scanned by Google. See Reference: Google Ngram project.

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