The Septennial Act replaced the Triennial Act of 1694 by allowing a Parliament to continue seven years before submitting itself to an election. The Act reduced the intensity of party political opposition between the Whigs and Tories, and facilitated the Whig supremacy and Robert Walpole's long domination of Parliament (to 1742). The Act would remain in effect until the Parliament Act of 1911 reduced the maximum length of a Parliament to five years.
Editors, Litencyc. "Septennial Act". The Literary Encyclopedia. First published 17 February 2006
[https://www.litencyc.com/php/stopics.php?rec=true&UID=1005, accessed 19 September 2019.]