Where does “triennially” come from?

triennially (English) comes from English triennial, from Latin triennium, from Latin triennis, from Latin annus, from Proto-Italic atnos, from Proto-Indo-European h₂et-no-, from Proto-Indo-European h₂et- — grass.

triennially (English): Occurring at intervals three years apart

Definitions

  1. Occurring at intervals three years apart

Ancestry of “triennially”, step by step

StepLanguageWordMeaning
1EnglishtriennialHappening every three years; Lasting for three...
2Latintrienniuma period of three years, triennium
3Latintriennisthree-year-old
4Latinannusyear; time; season
5Proto-Italicatnosyear
6Proto-Indo-Europeanh₂et-no-—
7Proto-Indo-Europeanh₂et-grass
Every word from Proto-Indo-European h₂et- →Every word from Proto-Indo-European h₂et-no- →Every word from Proto-Italic atnos →