Usage History of 'bivalent'

The following chart shows how frequently 'bivalent' appeared in printed materials over time. For example, the word 'bivalent' occurred 2 times in books in 1819 and 6,981 times in 2008. From 1819 to 2008, the word 'bivalent' was used a total of 288,841 times in books scanned by Google. See Reference: Google Ngram project.

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