Usage History of 'fortification'

The following chart shows how frequently 'fortification' appeared in printed materials over time. For example, the word 'fortification' occurred 3 times in books in 1524 and 52,936 times in 2008. From 1524 to 2008, the word 'fortification' was used a total of 1,397,715 times in books scanned by Google. See Reference: Google Ngram project.

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