Usage History of 'extern'

The following chart shows how frequently 'extern' appeared in printed materials over time. For example, the word 'extern' occurred 4 times in books in 1579 and 5,790 times in 2008. From 1579 to 2008, the word 'extern' was used a total of 203,810 times in books scanned by Google. See Reference: Google Ngram project.

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