Annual
Triennial
Triennial adjective - Occurring every third year or lasting 3 years.
Show all Definitions
Synonyms for Triennial
Mutual synonyms
Cite this Source
Triennial and Annual. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/annual/triennial
Annual & Triennial. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/annual/triennial>.
Triennial or Annual. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/annual/triennial.
Google Ngram Viewer shows how "annual" and "triennial" have occurred on timeline