Usage History of 'invisible'

The following chart shows how frequently 'invisible' appeared in printed materials over time. For example, the word 'invisible' occurred 2 times in books in 1563 and 679,955 times in 2008. From 1563 to 2008, the word 'invisible' was used a total of 13,159,870 times in books scanned by Google. See Reference: Google Ngram project.

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