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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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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Dictionary Entries near octennial

Octavius

octavo

octene

octennial

octet

octillion

octine

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