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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 ?
The intellectual production of the area has also greatly increased, increasing by 80% in the last 4 years, compared to the previous triennia, the period of years previously used in the CAPES evaluation (currently, evaluations are carried out every 4 years).
The program also held this status in previous triennia and the most recent 4-year evaluation, indicating the excellence level of the program.
In this context, this study aimed to analyze the effect of FA-related deaths in Mexico in recent years, to determine their impact on the country's life expectancy compared with other causes of death between the 2000-2002 and 2010-2012 triennia and to identify the degree to which different age groups contributed to the loss of years of life expectancy.
Based on the official information on deaths and population, abridged life tables were prepared, by sex, for the 2000-2002 and 2010-2012 triennia; for the construction of life tables, the EPIDAT version 3.1 (27) program was used, which employs the model tables developed by Coale and Demeny (28) as references for the pattern of mortality, specifically for the West family of the model, which is recommended for countries with mortality levels similar to those of Mexico (29).
The reported anaesthetic mortality rate per million population per annum was in a narrow range between 2.29 and 2.79 over the eight triennia, except for the 1988-1990 triennium, for which it was 1.8 (Table 3).
However, for the last three triennia the rate was between about 1:53,400 and 1:56,000 (Table 3).
Triennia had come into possession of a map of Lionesses and strange cipher, which showed the location of a secret.
6 illustrates the trend for the three triennia. There has been a consistent decline (17%) in the iMMR of preventable deaths since 2008, which suggests continued improvement in the quality of care (Fig.
The distribution of the major causes of potentially preventable maternal deaths over the three triennia indicated that the contribution of NPRI to the iMMR was declining, with a concomitant increase in the importance of HT and OH (Fig.
The plan outlines the proposed work of the national church for the next two triennia (three-year periods between General Synods) and succeeds Preparing the Way, a nine-year plan approved by General Synod in 1995 that ends this year.
It seemed to the task force members long enough for a leader to share a vision with the church and short enough to allow for renewal for both the position and the person." Such a term would also cover three triennia, since General Synod, the church's governing body, meets every three years.