IPA: /kənˈkjuːbɪnɪdʒ/
KK: /kɒnˈkjuːbɪnɪdʒ/
The situation where a man and a woman live together and have a sexual relationship without being legally married.
In some cultures, concubinage is accepted as a form of partnership.
Concubinage → It is formed from "con-" (meaning together) and "cumbere" (meaning to lie down). The word refers to the state of living together in a relationship that is not formally recognized as marriage, often implying a sexual relationship.
Think of people 'together' ('con-') who 'lie down' ('cumbere') in a relationship that is not officially married — that's what concubinage means.