Where does “Anno domini” come from?

Anno domini (English) comes from Medieval Latin anno Domini, from Latin anno, from Latin annus, from Proto-Italic atnos, from Proto-Indo-European h₂et-no-, from Proto-Indo-European h₂et- — grass.

Ancestry of “Anno domini”, step by step

Step	Language	Word	Meaning
1	Medieval Latin	anno Domini	in the year of the Lord
2	Latin	anno	Alternative form of adnō; I pass or live through...
3	Latin	annus	year; time; season
4	Proto-Italic	atnos	year
5	Proto-Indo-European	h₂et-no-	—
6	Proto-Indo-European	h₂et-	grass

Every word from Proto-Indo-European h₂et- →