Where does “quadrennium” come from?

quadrennium (Latin) comes from Latin annus, from Proto-Italic atnos, from Proto-Indo-European h₂et-no-, from Proto-Indo-European h₂et- — grass.

Ancestry of “quadrennium”, step by step

StepLanguageWordMeaning
1Latinannusyear; time; season
2Proto-Italicatnosyear
3Proto-Indo-Europeanh₂et-no-—
4Proto-Indo-Europeanh₂et-grass

Words derived from “quadrennium”

Every word from Proto-Indo-European h₂et- →Every word from Proto-Indo-European h₂et-no- →Every word from Proto-Italic atnos →
quadrennium — Etymology, Origin & Word History | Etymology Explorer