Definition of octennial in English:

octennial

Syllabification: oc·ten·ni·al
Pronunciation: /äkˈtenēəl
 
/

adjective

rare
  • 1Recurring every eight years.
    More example sentences
    • But this explanation appears to be inconsistent with the octennial period of the festival.
  • 1.1Lasting for or relating to a period of eight years.
    More example sentences
    • The Bill was, it is true, changed from a septennial to an octennial one.

Origin

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

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