decennium
de·cen·ni·um
noun \-nē-əm\ plural de·cen·ni·ums or -nia \-nē-ə\
Definition of DECENNIUM
: a period of 10 years : decade
Origin of DECENNIUM
Latin, from decem + annus year — more at annual
First Known Use: 1685
Rhymes with DECENNIUM
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