Usage History of 'invigilated'

The following chart shows how frequently 'invigilated' appeared in printed materials over time. For example, the word 'invigilated' occurred 2 times in books in 1814 and 154 times in 2008. From 1814 to 2008, the word 'invigilated' was used a total of 3,117 times in books scanned by Google. See Reference: Google Ngram project.

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