Where does “tricentennialis” come from?

tricentennialis (Latin) comes from Latin tri-, from Latin trēs, from Proto-Italic trēs, from Proto-Indo-European *tréyes.

Ancestry of “tricentennialis”, step by step

StepLanguageWordMeaning
1Latintri-three, tri-
2Latintrēsthree; 3
3Proto-Italictrēsthree
4Proto-Indo-European*tréyes—

Words derived from “tricentennialis”

Every word from Proto-Indo-European *tréyes →Every word from Proto-Italic trēs →Every word from Latin trēs →