hypergamy
noun
hy·per·ga·my hī-ˈpər-gə-mē 
plural hypergamies
: marriage into an equal or higher caste or social group
Example Sentences
Recent Examples on the Web The term 'high-value dating' has 136.6 million views on TikTok, while related phrases such as 'hypergamy' (132m) and 'high-value woman' (106m) are also thrown about regularly. 
Eve Upton-clark, refinery29.com, 21 Apr. 2022 Young migrant men will suffer all the more because of a preference among Chinese women for marrying men with more money or education (a practice known as hypergamy). The Economist, 3 May 2018
Eve Upton-clark, refinery29.com, 21 Apr. 2022 Young migrant men will suffer all the more because of a preference among Chinese women for marrying men with more money or education (a practice known as hypergamy). The Economist, 3 May 2018 Word History
First Known Use
1883, in the meaning defined above