Where does “Tricesimation” come from?

Tricesimation (German) comes from Latin tricesimus, from Latin trīgintā, from Proto-Indo-European tridḱómt, from Proto-Indo-European tri-, from Proto-Indo-European tréyes — three.

Ancestry of “Tricesimation”, step by step

StepLanguageWordMeaning
1Latintricesimusthirtieth
2Latintrīgintāthirty; 30
3Proto-Indo-Europeantridḱómtthirty
4Proto-Indo-Europeantri-three, threefold
5Proto-Indo-Europeantréyesthree

Words derived from “Tricesimation

Every word from Proto-Indo-European tréyesEvery word from Proto-Indo-European tri-Every word from Proto-Indo-European tridḱómt