First attested in 1868; from the Latin septennium, a collateral form of septuennium (“a period of seven years”).
"septennium." YourDictionary, n.d. Web. 22 March 2019. <https://www.yourdictionary.com/septennium>.
septennium. (n.d.). Retrieved March 22nd, 2019, from https://www.yourdictionary.com/septennium
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