Where does “initium” come from?

initium (Latin) comes from Latin inire, from Latin īre, from Proto-Italic eō, from Proto-Italic ejō, from Proto-Indo-European h₁éyti, from Proto-Indo-European h₁ey- — to go.

initium (Latin): beginning, start; rites, mysteries

Definitions

beginning, start; rites, mysteries

Ancestry of “initium”, step by step

initium traces back through two separate lines of ancestry.

via Latin inire

Step	Language	Word	Meaning
1	Latin	inire	present active infinitive of ineō; to go in,...
2	Latin	īre	—
3	Proto-Italic	eō	I go
4	Proto-Italic	ejō	—
5	Proto-Indo-European	h₁éyti	to go, to be going
6	Proto-Indo-European	h₁ey-	to go

via Latin ineō

Step	Language	Word	Meaning
1	Latin	ineō	to enter, go into
2	Latin	eō	to go, to fare, to move (oneself) (any kind of animate or inanimate motion: walk, ride, sail, fly, etc.)
3	Classical Latin	egō̆	—
4	Proto-Italic	egō	I
5	Proto-Indo-European	éǵh₂	I

Words derived from “initium”

Every word from Proto-Indo-European h₁ey- →Every word from Proto-Indo-European h₁éyti →Every word from Proto-Italic ejō →