quin·quen·ni·um
| \ kwin-ˈkwe-nē-əm
, kwiŋ- \
, kwiŋ- \
plural quinquenniums or quinquennia\
kwin-ˈkwe-nē-ə
, kwiŋ-
\
, kwiŋ-
\
Definition of quinquennium
: a period of five years
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“Quinquennium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/quinquennium. Accessed 11 Apr. 2021.
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Time Traveler for quinquennium
The first known use of quinquennium was in 1621
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