Where does “enteren” come from?

enteren (Middle English) comes from French entrer, from Middle French entrer, from Old French entrer, from Latin intrō, from Latin intra, from Latin interus, from Proto-Indo-European h₁énteros, from Proto-Indo-European -teros — Contrastive or oppositional adjectival suffix.

Ancestry of “enteren”, step by step

enteren traces back through 3 separate lines of ancestry.

via French entrer

Step	Language	Word	Meaning
1	French	entrer	to enter
2	Middle French	entrer	to enter
3	Old French	entrer	to enter
4	Latin	intrō	to enter, go into, come in, get in, penetrate
5	Latin	intra	within; inside; during; less than
6	Latin	interus	—
7	Proto-Indo-European	h₁énteros	inside, within
8	Proto-Indo-European	-teros	Contrastive or oppositional adjectival suffix

via Old French enterrer

Step	Language	Word	Meaning
1	Old French	enterrer	to bury
2	Latin	interrō	bury, inter
3	Latin	în	in, at, on, upon, from (space)
4	Latin	en	lookǃ beholdǃ; reallyǃ?; come onǃ
5	Proto-Italic	en	in

via Spanish entrar

Step	Language	Word	Meaning
1	Spanish	entrar	to enter; to come in, to get in, to go in, to get...
2	Old Spanish	entrar	to enter

Words derived from “enteren”

Every word from Proto-Indo-European -teros →Every word from Proto-Indo-European h₁énteros →Every word from Latin interus →