WordNet
n. a relation between living organisms (especially between people)
Wikipedia
In social science, a social relation or social interaction is any relationship between two or more individuals. Social relations derived from individual agency form the basis of social structure and the basic object for analysis by social scientists. Fundamental inquiries into the nature of social relations feature in the work of sociologists such as Max Weber in his theory of social action.
Categorizing social interactions enables observational and other social research, such as Gemeinschaft and Gesellschaft (lit. "Community and Society"), collective consciousness, etc. However different schools and theories of sociology and other social sciences dispute the methods used for such investigations.
Usage examples of "social relation".
It was inevitable that this one case of a social relation grounded on force, would survive through generations of institutions grounded on equal justice, an almost solitary exception to the general character of their laws and customs.
Every one was kind to Guy Dawnish -- some rather importunately so, as Margaret Ransom had smiled to observe -- but it was recognized as fitting that she should be kindest, since he was in a sense her property, since his people in England, by profusely acknowledging her kindness, had given it the domestic sanction without which, to Wentworth, any social relation between the sexes remained unhallowed and to be viewed askance.
Many people are unaware of such groups, for they are seldom identifiable save through lines of social relation and connection.
He lived alone, and, so to speak, outside of every social relation.