What is the term for two individuals regarded as a pair, such as a husband and wife?

The term that refers to two individuals regarded as a pair, such as a husband and wife, is "dyad." In social sciences and psychology, a dyad specifically denotes a group of two individuals who interact with each other. This concept is foundational in understanding relationships and dynamics that occur between pairs, as it allows for exploration of interdependence, communication patterns, and collective behaviors that arise in such intimate connections.

While "double" generally refers to two of something or a duplication, it does not capture the relational aspect inherent in the term dyad. "Diad" is an incorrect variation of the term and lacks clear usage in this context. "Duality" implies a state of having two elements or aspects, but it is broader and does not specifically pertain to the relational pairing of two individuals. Thus, dyad is the most precise term to describe the specific pairing of two individuals like a husband and wife.