Usage History of 'triennium'

The following chart shows how frequently 'triennium' appeared in printed materials over time. For example, the word 'triennium' occurred 1 time in books in 1581 and 1,202 times in 2008. From 1581 to 2008, the word 'triennium' was used a total of 44,148 times in books scanned by Google. See Reference: Google Ngram project.

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