Usage History of 'invigilate'

The following chart shows how frequently 'invigilate' appeared in printed materials over time. For example, the word 'invigilate' occurred 2 times in books in 1687 and 160 times in 2008. From 1687 to 2008, the word 'invigilate' was used a total of 3,298 times in books scanned by Google. See Reference: Google Ngram project.

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