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n. pl. tri·en·ni·ums or tri·en·ni·a (-ĕn′ē-ə)
A period of three years.

[Latin : tri-, tri- + annus, year; see at- in Indo-European roots.]
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.


n, pl -niums or -nia (-nɪə)
a period or cycle of three years
[C19: from Latin, from tri- + annus a year]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(traɪˈɛn i əm)

n., pl. -en•ni•ums, -en•ni•a (-ˈɛn i ə)
a period of three years.
[1840–50; < Latin, =trienn(is) pertaining to three years (tri- tri- + -ennis, adj. comb. form of annus year) + -ium -ium1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


 a period of three years, 1847.
Dictionary of Collective Nouns and Group Terms. Copyright 2008 The Gale Group, Inc. All rights reserved.


nZeitraum mvon drei Jahren
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
References in periodicals archive ?
It said one of the agreements was for the triennium April 1, 2016 to March 31, 2019; and the other for the period April 1, 2019 to March 31, 2022.
According to the SA Confidential Enquiries into Maternal Deaths, [4] 2.35% of deaths resulted from ectopic pregnancy in the 2011-2013 triennium. The percentage has consistently remained <2% and has only increased in the last triennium.
The categories include: 'State with most improved Quality of Aviation Infrastructure', 'Outstanding Global Connectivity Award', 'Outstanding Resource Contribution to ICAO Programs', 'Outstanding International Cooperation Programs', 'Aviation personality of the Triennium' and 'Innovation Award' (encompassing aviation safety, security, sustainability, passenger experience).
Earlier, during the opening ceremonies, Uruguay, the COP12 host country, handed over the ceremonial Ramsar flag to UAE, transferring the COP Presidency for the next triennium.
This year, Asfour is set to launch her strategy for her triennium ending in 2020.
In the triennium 1998-2000, the Postgraduate Program in Psychology of UFRGS earned a score of "five;" in the following period, it earned a score of "six;" and since the triennium 2004-2006, it has maintained a score of "seven," the maximum score of the CAPES evaluation.
The agenda covered reports of the officers of the EC for the 2014-2017 triennium. Then, the elections for the positions of President Elect, Secretaries for Education, Sections and Publications, and the Zone Representatives were conducted by electronic ballot.
The synod also passed a motion directing diocesan council to focus its energies over the next triennium on developing a mission plan for the diocese.
Among the issues the parties will consider the funding level for the replenishment of the multilateral fund for the Implementation of the Montreal Protocol for the 2018 to 2020 triennium to support developing countries in their efforts to continue the phase-out of ozone-depleting hydro chloro fluoro carbons (HCFCs) and to initiate enabling activities for the phase-down of HFCs.
We used SIM data in the triennium 2011-2013 and the Brazilian population in 2012 as the standard population.
The PUC has established specific energy savings targets for the first triennium of the EERS program, which are benchmarked against electricity and natural gas sales delivered in 2014.