Usage History of 'pili'

The following chart shows how frequently 'pili' appeared in printed materials over time. For example, the word 'pili' occurred 2 times in books in 1581 and 6,530 times in 2008. From 1581 to 2008, the word 'pili' was used a total of 216,516 times in books scanned by Google. See Reference: Google Ngram project.

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