octennial

[ok-ten-ee-uhl]
adjective
1.
occurring every eight years.
2.
of or for eight years.

Origin:
1650–60; < Late Latin octenni(um) eight-year period (oct- oct- + -enn-, combining form of annus year + -ium -ium) + -al1

octennially, adjective
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World English Dictionary
octennial (ɒkˈtɛnɪəl)
 
adj
1.  occurring every eight years
2.  lasting for eight years
 
[C17: from Latin octennium eight years, from octo eight + annus year]
 
oc'tennially
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The potential also exists for the state legislature to change the current mandated octennial revaluation plan to a four-year plan.
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