Usage History of 'outgroups'

The following chart shows how frequently 'outgroups' appeared in printed materials over time. For example, the word 'outgroups' occurred 4 times in books in 1798 and 3,866 times in 2008. From 1798 to 2008, the word 'outgroups' was used a total of 92,245 times in books scanned by Google. See Reference: Google Ngram project.

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