1 octennial | Definition of octennial
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octennial

adjective
oc·​ten·​ni·​al | \ (ˈ)äk¦tenÄ“É™l\

Definition of octennial

1 : happening every eighth year
2 : lasting for a period of eight years

History and Etymology for octennial

Late Latin octennium period of eight years (from Latin oct- —from octo eight—+ -ennium, from annus year) + English -al

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