Interpersonal relationship
Strong, deep, or close association or acquaintance between two or more people
In social psychology, an interpersonal relation (or interpersonal relationship) describes a social association, connection, or affiliation between two or more people. It overlaps significantly with the concept of social relations, which are the fundamental unit of analysis within the social sciences. Relations vary in degrees of intimacy, self-disclosure, duration, reciprocity, and power distribution.
From Wikipedia, under CC BY-SA. More on occurri.