/mɒˈnɒɡəmiˈ/ – Noun
Definition: chế độ một vợ một chồng.
A more thorough explanation: Monogamy is a legal term that refers to the practice or state of being married to only one person at a time. It is a form of marriage in which an individual has only one spouse at any given time.
Example: In many jurisdictions, marriage is considered a legal contract that implies monogamy between the spouses.