Usage History of 'focus'

The following chart shows how frequently 'focus' appeared in printed materials over time. For example, the word 'focus' occurred 6 times in books in 1515 and 3,375,679 times in 2008. From 1515 to 2008, the word 'focus' was used a total of 56,379,654 times in books scanned by Google. See Reference: Google Ngram project.

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