Usage History of 'brightening'

The following chart shows how frequently 'brightening' appeared in printed materials over time. For example, the word 'brightening' occurred 2 times in books in 1681 and 39,178 times in 2008. From 1681 to 2008, the word 'brightening' was used a total of 564,373 times in books scanned by Google. See Reference: Google Ngram project.

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