septennial

sep·ten·ni·al

 (sĕp-tĕn′ē-əl)
adj.
1. Occurring every seven years.
2. Consisting of or continuing for seven years.
n.
An event that occurs every seven years.

[From Late Latin septennium, period of seven years, from Latin septennis, of seven years : septem, seven; see septm̥ in Indo-European roots + annus, year; see at- in Indo-European roots.]

sep·ten′ni·al·ly adv.

septennial

(sɛpˈtɛnɪəl)
adj
1. occurring every seven years
2. relating to or lasting seven years
[C17: from Latin septennis, from septem seven + annus a year]
sepˈtennially adv

sep•ten•ni•al

(sɛpˈtɛn i əl)

adj.
1. occurring every seven years.
2. lasting or consisting of seven years.
[1630–40; < Late Latin septenni(s) (Latin septuennis) seven years old (sept(em) seven + -enn-, comb. form of annus year + -is adj. suffix) + -al1]
sep•ten′ni•al•ly, adv.
Translations

septennial

adjsiebenjährig; (= every seven years)alle sieben Jahre stattfindend, siebenjährlich
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References in classic literature ?
Is it to be presumed, that at any future septennial epoch the same State will be free from parties?
Unsurprisingly, given the unanimity needed to strike the septennial MFF deals, Aksoy (2010) finds that smaller countries, which are relatively over-represented in both the European Parliament and the Council, obtain higher shares of EU spending than would be predicted.
Does it not sometimes too much resemble that septennial exhibition of humility, which calls forth so much smiling condescension from the powerful, while it conveys "an hour's importance to the poor man's heart?
The Radicals wanted Annual Parliaments after England had tried Triennial Parliaments originally in 1641, and then in 1694, and Britain had tried Septennial Parliaments after the Union, in 1716, and eventually Five-Year Parliaments in 1911.
This debate became even more fevered when the Hanoverian George I, and his Whig supporters in Parliament, claimed that elections every three years were too costly and introduced the Septennial Act 1715, thereby increasing the length of a single Parliament to seven years to deny Tories who supported the Stuarts electoral opportunities.
Ce debat atteint un paroxysme quand Georges 1er de Hanovre et ses partisans du Parti whig au Parlement soutiennent qu'il en coute trop cher de tenir des elections tous les trois ans et presentent la Septennial Act 1715, augmentant ainsi a sept ans la duree d'une legislature pour priver les Tories, favorables aux Stuart, de chances de se faire elire.
A Tory government would have to amend the Septennial Act of 1715, which requires elections at least every five years.
By the 1760s, the issue of Episcopal visitation queries to clergy had become the norm, although the visitations themselves, were not always conducted triennially in accordance with the Church of England's canons, being quadrennial in at least four dioceses, septennial at Norwich and only conducted once each episcopate in Winchester.
The new venue is the brainchild of Steve Smith, director of Septennial Entertainment which already owns Sugar, The Sausage, Moo bar and The Garden in Leamington.
155) For Madison, however, "the degree of liberty retained even under septennial elections" in Great Britain left no doubt that two-year terms presented no danger of oppression.
It was equally applicable to monthly and septennial periods.