Usage History of 'invigilator'

The following chart shows how frequently 'invigilator' appeared in printed materials over time. For example, the word 'invigilator' occurred 2 times in books in 1895 and 441 times in 2008. From 1895 to 2008, the word 'invigilator' was used a total of 9,420 times in books scanned by Google. See Reference: Google Ngram project.

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