Usage History of 'unobservable'

The following chart shows how frequently 'unobservable' appeared in printed materials over time. For example, the word 'unobservable' occurred 2 times in books in 1651 and 14,510 times in 2008. From 1651 to 2008, the word 'unobservable' was used a total of 334,072 times in books scanned by Google. See Reference: Google Ngram project.

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