Usage History of 'triennial'

The following chart shows how frequently 'triennial' appeared in printed materials over time. For example, the word 'triennial' occurred 2 times in books in 1637 and 14,243 times in 2008. From 1637 to 2008, the word 'triennial' was used a total of 439,133 times in books scanned by Google. See Reference: Google Ngram project.

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