octennial

adjective oc·ten·ni·al \ (ˈ)äk¦tenēəl \

Definition of octennial

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

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Origin and Etymology of octennial

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


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