"Exogamy is the social norm of marrying outside one´s social group. The group defines the scope and extent of exogamy, and the rules and enforcement mechanisms ...
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that ensure its continuity. One form of exogamy is dual exogamy, in which two groups engage in continual wife exchange.
In social science, exogamy is viewed as a combination of two related aspects: biological and cultural. Biological exogamy is marriage of nonblood-related beings, regulated by forms of incest law. Cultural exogamy is marrying outside a specific cultural group; the opposite being endogamy, marriage within a social group." - (en.wikipedia.org 09.01.2022)