Usage History of 'portals'

The following chart shows how frequently 'portals' appeared in printed materials over time. For example, the word 'portals' occurred 4 times in books in 1624 and 74,677 times in 2008. From 1624 to 2008, the word 'portals' was used a total of 1,236,002 times in books scanned by Google. See Reference: Google Ngram project.

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