1. Occurring every seven years.
2. Consisting of or continuing for seven years.
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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. occurring every seven years
2. relating to or lasting seven years
[C17: from Latin septennis, from septem seven + annus a year]
sepˈtennially adv
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(sɛpˈtɛn i əl)

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.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


adjsiebenjährig; (= every seven years)alle sieben Jahre stattfindend, siebenjährlich
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
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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?
Normally, one would say "yes." The kind of full-blown systemic global financial crisis that erupted a decade ago is not like a typical septennial recession.
Indeed, this piece of history regarding the septennial referenda which used to take place in those districts in Wales where the pubs were closed on a Sunday, until the late 1990s, when all the districts in Wales permitted Sunday opening, demonstrates it was possible to revisit an issue, and that, in time, the attitude of the public could shift.
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.
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.