Where does “ante merīdiem” come from?

ante merīdiem (Medieval Latin) comes from Latin ante, from Ancient Greek κλίσις, from Ancient Greek -σῐς, from Ancient Greek -τις, from Proto-Indo-European -tis — Derives abstract/action nouns from verb roots.

Ancestry of “ante merīdiem”, step by step

StepLanguageWordMeaning
1Latinantebefore, in front, forwards; before; before,...
2Ancient Greekκλίσιςbending, inclination; a lying down; a place for...
3Ancient Greek-σῐς"suffix forming nouns"
4Ancient Greek-τιςretained after dentals
5Proto-Indo-European-tisDerives abstract/action nouns from verb roots

Words derived from “ante merīdiem”

Every word from Proto-Indo-European -tis →Every word from Ancient Greek -σῐς →Every word from Ancient Greek κλίσις →