Where does “allitero” come from?

allitero (Latin) comes from Latin Ad, from Latin illic, from Latin ille, from Latin olle, from Proto-Italic *olnos — that.

Ancestry of “allitero”, step by step

allitero traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Latin	Ad	toward, to
2	Latin	illic	he, she, it, yonder, that, overthere; in that...
3	Latin	ille	that; those; "; demonstrative pronoun "; that...
4	Latin	olle	Archaic form of ille
5	Proto-Italic	*olnos	that

Step	Language	Word	Meaning
1	Latin	lītera	—
2	Old Latin	leitera	—
3	Proto-Indo-European	h₂leyH-	to smear
4	Proto-Indo-European	leyh₂-	to die, disapear; to avoid, elude, decline,...