Usage History of 'once'

The following chart shows how frequently 'once' appeared in printed materials over time. For example, the word 'once' occurred 4 times in books in 1505 and 13,408,251 times in 2008. From 1505 to 2008, the word 'once' was used a total of 267,311,991 times in books scanned by Google. See Reference: Google Ngram project.

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