/kɒnˈkjuːbɪnɪʤ/ – noun
Definition: việc sống chung ngoài hôn thú,quan hệ ngoại hôn.
A more thorough explanation: Concubinage is a legal relationship between a man and a woman who live together and engage in a sexual relationship without being legally married.
Example: The court found evidence of a long-standing concubinage relationship between the defendant and the plaintiff, which influenced the division of assets in the divorce settlement.