Where does “per-” come from?

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

Ancestry of “per-”, step by step

StepLanguageWordMeaning
1Esperantoperby means of, with
2Latinperthrough, by means of; throughout, during
3LatinAdtoward, to
4Latinilliche, she, it, yonder, that, overthere; in that...
5Latinillethat; those; "; demonstrative pronoun "; that...
6LatinolleArchaic form of ille
7Proto-Italic*olnosthat

Words derived from “per-”

Every word from Proto-Italic *olnos →Every word from Latin olle →Every word from Latin ille →