What term is often used to describe a close relationship or kinship?

The term "propinquity" specifically refers to physical proximity or nearness in terms of place or relationship, and it is often used to describe a close relationship or kinship. This term emphasizes the closeness or nearness of individuals, suggesting a sense of physical and emotional connection that can lead to familial or deep personal ties. In various contexts, propinquity can imply that relationships are nurtured through mere physical closeness and regular interaction.

While "affinity" can denote a natural liking or sympathy for someone, it does not intrinsically suggest physical closeness or kinship in the same way. "Connection" and "association" are broader terms that refer to links or relationships between individuals but lack the specific connotation of close kinship or intimacy inherent in the concept of propinquity. Therefore, propinquity most accurately captures the essence of a close familial or relational bond.