Where does “accidentalis” come from?

accidentalis (Late Latin) comes from Latin accidēns, from Latin accidō, from Latin ad-, from Latin īn-, from Latin în, from Latin en, from Proto-Italic en, from Proto-Indo-European h₁én — in.

Ancestry of “accidentalis”, step by step

Step	Language	Word	Meaning
1	Latin	accidēns	falling down, upon, at or near, descending
2	Latin	accidō	to fall down, upon, at or near; descend
3	Latin	ad-	to; usually prefixed to verbs, in which cases it...
4	Latin	īn-	un-, non-, not
5	Latin	în	in, at, on, upon, from (space)
6	Latin	en	lookǃ beholdǃ; reallyǃ?; come onǃ
7	Proto-Italic	en	in
8	Proto-Indo-European	h₁én	in

Words derived from “accidentalis”

Every word from Proto-Indo-European h₁én →Every word from Latin īn- →Every word from Latin ad- →