Oc‐ten″ni‐al (?), a. [L. octennium a period of eight years; octo eight + annus year.] Happening every eighth year; also, lasting a period of eight years. Johnson. — Oc‐ten″ni‐al‐ly, adv.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.