septennial

adj.

七年一次的，延续七年的；

The Septennial Act of 1716
Three (More) Division Lists from the Ailesbury Manuscripts: On the ‘Church in Danger’ (1705), the Septennial Bill and Forfeited Es...
Septennial Feasts and Processions in the Meuse-Rhine region. Dynamics and Flexibility of a Tradition
On the Septennial Cycle of the Torah Reading in Early Palestine / על המחזור השבע-שנתי של הקריאה בתורה ...
The duration of parliament: Historical perspectives on the 1911 amendment to the septennial act
RURAL PENNSYLVANIA IN 1800: A PORTRAIT FROM THE SEPTENNIAL CENSUS
[The retropenitoneal fibrosis (septennial observation of a female patient) (author's transl)]
For a Septennial Anniversary
Sir Richard Steel's speech for repealing of the Triennial Act and his reasons for the septennial bill As it was spoken in the House ...
Septennial parliaments vindicated. Humbly addressed to his excellency the Earl of Hertford