Usage History of 'deepening'

The following chart shows how frequently 'deepening' appeared in printed materials over time. For example, the word 'deepening' occurred 2 times in books in 1515 and 128,032 times in 2008. From 1515 to 2008, the word 'deepening' was used a total of 2,689,188 times in books scanned by Google. See Reference: Google Ngram project.

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