1. Occurring every six years.
2. Relating to or lasting six years.
An event that occurs every six years.

[From Latin sexennium, of six years : sex, six; see sex- + annus, year; see at- in Indo-European roots.]

sex·en′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.


occurring once every six years or over a period of six years
a sixth anniversary
[C17: from Latin sexennis of six years, from sex six + annus a year]
sexˈennially adv
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
The city's sexennial reappraisal for tax year 2017 resulted in an increase in TAV of over 11%.
Few things have damaged Maronite interests more than the sexennial race for the presidency, dividing the political class and injecting an element of the irrational into the thinking of communal politicians.
Whatever these politicians now feel about today's events - whether they warn against disloyalty, or fear they are being suspected , or they truly believe no one would want to leave a "principled" party in power -- we may now be seeing the start of the sexennial migration of politicians, corresponding to the six-year terms of our presidents.
The Senate consists of 30 members elected by popular vote, two-thirds to sexennial terms and one-third for two-year periods.
Throughout Calderon's sexennial, the main cases against drug traffickers and public officials who protected groups other than El Chapo's were based on the testimony of other criminals.
In kindergarten, a strange impulse, a mixture of curiosity and fear, led me to the imitation Japanese garden, little house and all; to the elevated paths of the parque del Calvario, an immense, fenced hill in the middle of the city founded during one sexennial or another and forgotten thereafter; especially to its sundial, in front of which Juan Jose Arreola once stood; to the cages of the reptile park at the zoo, which almost no one visited because it was indoors and dark; to all the unused classrooms in my elementary school, home to broken-down desks; and to the big movie theater on the adjoining lot, which had been destroyed by an earthquake, and from which I was almost able to steal original posters of Canoa and 2001: A Space Odyssey, abandoned on the floor of the foyer.
To keep the markets calm during the upcoming election in 2000, the Mexican government unveiled a $24 billion financing program to ensure an "orderly transition." The International Monetary Fund, The World Bank and the, Inter-American Development Bank, among others, agreed to make the money available for the government's reserves in a bid to end the sexennial curse.
However, management expects the city's sexennial reappraisal for tax year 2017 to result in a 12% increase in TAV, with values exceeding pre-recessionary levels.
* It's important to mention that nowadays there are "good" intentions from the three levels of Mexican government, but in reality the sexennial goals haven't been reached.