triennial
nounEtymology From Latin triennium (“three-year period”), from tres (“three”) + annus (“year”). By surface analysis, tri- + -ennial.
1
A third anniversary.
2
A plant that requires three years to complete its life-cycle.
triennial
adj/tɹaɪˈɛni.əl/
Etymology From Latin triennium (“three-year period”), from tres (“three”) + annus (“year”). By surface analysis, tri- + -ennial.
1
Happening every three years.
- triennial elections
- They were constantly summoned to a triennial festival : and the most approved songs delivered at this assembly were ordered to be preserved in the custody of the king's historian or antiquary1774-1781, Thomas Warton, History of English Poetry:
2
Lasting for three years.
- triennial parliaments; a triennial reign
- September 13 1621, James Howell. letter to Sir William Saint John Triennial Subsidies
- Synonyms
- trieterical
- Related terms
- triennium, triennially