What is the term that refers to an individual's status in terms of being married, single, divorced, or widowed?

The term that accurately refers to an individual's status in terms of being married, single, divorced, or widowed is "marital status." This term specifically addresses the legal recognition of a person's relationship to another individual, which can include various conditions such as marriage, separation, or death of a spouse.

While "family status" could encompass broader aspects of an individual's familial relationships, it does not specifically focus on the legal relationship aspect associated with marriage. "Relationship status" is often used in casual contexts and may refer to a variety of personal relationships, not just those recognized legally. "Legal status" can pertain to a broader range of legal recognitions and situations beyond marital relations, which does not directly address the context of one's marital condition.

Thus, "marital status" is the most precise and relevant term for describing the state of an individual's marriage or partnership status.