Homogamy (sociology)

Homogamy is marriage between individuals who are, in some culturally important way, similar to each other. It is a form of assortative mating. The union may be based on socioeconomic status, class, gender, caste, ethnicity, or religion, or age in the case of the so-called age homogamy.

It can also refer to the socialization customs of a particular group in that people who are similar tend to socialize with one another.