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The practice of marrying into an equal or more prestigious social group or caste.
1. (Anthropology & Ethnology) a custom that forbids a woman to marry a man of lower social status
2. (Anthropology & Ethnology) any marriage with a partner of higher social status
[C19: from hyper- + -gamy]
hy•per•ga•my(haɪˈpɜr gə mi)
marriage to a person of a social status higher than one's own; orig., esp. in India, the custom of allowing a woman to marry only into her own or a higher social group.