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octennial

Syllabification: (oc·ten·ni·al)
Pronunciation: /äkˈtenēəl/
Definition of octennial

adjective

rare
  • recurring every eight years.
  • lasting for or relating to a period of eight years.

Origin:

mid 17th century: from late Latin octennium 'period of eight years' + -al

octennial in other Oxford dictionaries

Definition of octennial in the British & World English dictionary

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