septennial
Adjective
Meaning
Lasting or continuing seven years; as, septennial parliaments.
Happening or returning once in every seven years; as, septennial elections in England.
Source: Webster's dictionarySynonyms
centennial
jubilee
bicentennial
seven
triennial
sesquicentennial
anniversary
commemoration
centenary
octagonal
biennial
leap year
septenary
sextuple
million
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Examples
As the frequent elections were deemed inconvenient, the Septennial Act 1715 extended the maximum to seven years, but the Parliament Act 1911 reduced it to five.
In 1716, the Septennial Act was passed, which had a number of consequences.