Where does “entr'ouvèrtément” come from?

entr'ouvèrtément (Norman) comes from Norman entr'ouvèrt, from Norman ouvèrt, from Old French overt, from Old French ovrir, from Vulgar Latin operire, from Latin aperīre, from Latin aperiō, from Proto-Indo-European h₂epó — off, away.

Definitions

Ancestry of “entr'ouvèrtément”, step by step

Step	Language	Word	Meaning
1	Norman	entr'ouvèrt	half-open
2	Norman	ouvèrt	open
3	Old French	overt	past participle of ovrir
4	Old French	ovrir	to open
5	Vulgar Latin	operire	—
6	Latin	aperīre	—
7	Latin	aperiō	to uncover, make or lay bare, reveal, clear
8	Proto-Indo-European	h₂epó	off, away

Every word from Proto-Indo-European h₂epó →Every word from Latin aperiō →Every word from Latin aperīre →