Exogamy

Exogamy is the social norm of mating or marrying outside one's social group. The group defines the scope and extent of exogamy, and the rules and enforcement mechanisms that ensure its continuity. One form of exogamy is dual exogamy, in which two groups continually intermarry with each other.

statute

marriage between two people from different countries

marriage between individuals of different ethnic backgrounds

Heterogamy is a term applied to a variety of distinct phenomena in different scientific domains. Usually having to do with some kind of difference, "hetero", in reproduction, "gamy". See below for more specific senses.

tradition of remembering ancestors (at least seven generations deep) among various Turkic people

structuralist method of studying kinship relations