Where does “entere” come from?

entere (Middle English) comes from Anglo-Norman entier, from Latin integrum, from Latin integer, from Proto-Italic *n̥tagros.

Ancestry of “entere”, step by step

Step	Language	Word	Meaning
1	Anglo-Norman	entier	entire; whole
2	Latin	integrum	nominative neuter singular of integer; accusative...
3	Latin	integer	complete, whole, intact; uninjured, sound,...
4	Proto-Italic	*n̥tagros	—

entere — Etymology, Origin & Word History | Etymology Explorer