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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 ?
Considering articles and books/chapters together, a mean of 55.2 items/program/year was verified, which corresponds to 4.1 items/PP/year, exceeding the mean of the previous two trienniums (3.2).
Private secular institutions have an extremely limited presence regarding academic courses; however they offer the only two professional master's courses of the area, both approved in the last triennium.
Many courses are included that were evaluated in 2013, as well as those authorized by CAPES in the final year of the 2010-2012 triennium, with their grades of authorization from the Scientific-Technical Council (CTC/ES).
The following Table-1 indicates the per capita SDP of Eighteen Indian states for three trienniums 1982-83, 1991-92, and 2004-05.
As it is evident from the below given table that the per capita SDP in different above mentioned states are varying with a large amount in all the three triennium endings.
The growth rates in the state domestic products has been calculated by taking the log of base triennium's SDP (average of three consecutive years) and by subtracting it from the log of last triennium's SDP.
To construct the concentration curves of ODA for BSS corresponding to each triennium, the recipient countries are ranked in ascending order according to their HDI; the ODA received by these countries is calculated for the three trienniums under study, and the cumulative percentage of the ODA received by these countries is calculated out of the total distributed.
The decision to analyse aid by trienniums instead of annually is due to the previous analysis of annual aid, which detected the irregularity of aid in consecutive years, leading to a distorted analysis depending on the year included.
By sector, the most important quantitative growth was in policies and programs for Population and Reproductive Health, which rose from 33 per cent to 46 per cent of ODA for BSS in the trienniums under analysis (Table 3).
To ensure the church continues to move, the presbytery has shown its support for youth and young adults, providing travel allowances that have made it possible for large numbers of young people and adult advisers to attend the youth trienniums, held at Purdue University in Indiana, and the Canada 2000 and 2003 youth gatherings.
The 1992 and 1995 Presbyterian Youth Trienniums were key turning points in my faith journey.
One of the strongest influences in my Christian walk was the 1992 Presbyterian Youth Triennium at Purdue University in West Lafayette, Indiana.