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Octennially

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Octennial \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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