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septennial

sep·ten·ni·al [ sep ténnee əl ]


adjective 
Definition:
 
1. for 7 years: lasting seven years

2. happening every 7 years: occurring once every seven years



noun  (plural sep·ten·ni·als)
Definition:
 
septennial event: something that happens every seven years

[Mid-17th century. < Latin septennium (see septennium)]

sep·ten·ni·al·ly adverb
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