the.com/cohabitation

means The state of living together and sharing a domestic life, typically as an unmarried couple.

from Built from Latin co- ('together') plus habitare ('to dwell, to have frequently'), itself a cousin of habere ('to have, to hold'). Habitare already carried the sense of repeated or settled dwelling in Latin, so cohabitare meant simply 'to live together' — the word entered English in that plain sense before it picked up its later legal and social shading around unmarried couples sharing a household.