Usage History of 'contractional'

The following chart shows how frequently 'contractional' appeared in printed materials over time. For example, the word 'contractional' occurred 4 times in books in 1864 and 687 times in 2008. From 1864 to 2008, the word 'contractional' was used a total of 15,104 times in books scanned by Google. See Reference: Google Ngram project.

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