triennial

== English == === Etymology === From Latin triennium (“three-year period”), from tres (“three”) + annus (“year”). By surface analysis, tri- +‎ -ennial. === Pronunciation === IPA(key): /tɹaɪˈɛniəl/ Rhymes: -ɛniəl === Adjective === triennial (not comparable) Happening every three years. Lasting for three years. September 13 1621, James Howell. letter to Sir William Saint John Triennial Subsidies ==== Synonyms ==== (rare): trieterical ==== Related terms ==== (noun): triennium ==== Translations ==== ==== See also ==== triennially === Noun === triennial (plural triennials) A third anniversary. A plant that requires three years to complete its life-cycle. ==== Related terms ==== biennial triennium triannual ==== Translations ====