Usage History of 'invigilations'

The following chart shows how frequently 'invigilations' appeared in printed materials over time. For example, the word 'invigilations' occurred 4 times in books in 1965 and 10 times in 2008. From 1965 to 2008, the word 'invigilations' was used a total of 110 times in books scanned by Google. See Reference: Google Ngram project.

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