Where does “pertinent” come from?

pertinent (Middle English) comes from Old French pertinent, from Latin pertinens, from Latin pertineō, from Latin per, from Latin Ad, from Latin illic, from Latin ille, from Latin olle — that.

Ancestry of “pertinent”, step by step

StepLanguageWordMeaning
1Old Frenchpertinent
2Latinpertinensextending; pertaining
3Latinpertineōto extend, stretch out, reach, matter
4Latinperthrough, by means of; throughout, during
5LatinAdtoward, to
6Latinilliche, she, it, yonder, that, overthere; in that...
7Latinillethat; those; "; demonstrative pronoun "; that...
8LatinolleArchaic form of ille
9Proto-Italic*olnosthat

Words derived from “pertinent

Every word from Proto-Italic *olnosEvery word from Latin olleEvery word from Latin ille