SINCE 1828
quinquennium
noun
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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The first known use of quinquennium was in 1621
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