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octennial

 - 1 dictionary result

oc⋅ten⋅ni⋅al

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

Origin:
1650–60; < LL octenni(um) eight-year period (oct- oct- + -enn-, comb. form of annus year + -ium -ium ) + -al 1


oc⋅ten⋅ni⋅al⋅ly, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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