Usage History of 'improvability'

The following chart shows how frequently 'improvability' appeared in printed materials over time. For example, the word 'improvability' occurred 4 times in books in 1792 and 568 times in 2008. From 1792 to 2008, the word 'improvability' was used a total of 15,936 times in books scanned by Google. See Reference: Google Ngram project.

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