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octennial

oc·ten·ni·al [ ok ténnee əl ]


adjective 
Definition:
 
1. happening every eight years: occurring at intervals of eight years

2. lasting eight years: lasting for a period of eight years

[Mid-17th century. < late Latin octennium "period of eight years" < Latin octo "eight"]

oc·ten·ni·al·ly adverb
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