Where does “cohabitacioun” come from?

cohabitacioun (Middle English) comes from Old French cohabitacion, from Late Latin cohabitātiō.

Ancestry of “cohabitacioun”, step by step

Step	Language	Word	Meaning
1	Old French	cohabitacion	—
2	Late Latin	cohabitātiō	—

cohabitacioun — Etymology, Origin & Word History | Etymology Explorer