mésalliance
Pronunciation: /ˌmāzəˈlīəns, ˌmāˌzalˈyäNs
noun
a marriage with a person thought to be unsuitable or of a lower social position.
Origin
French, from més- 'wrong, misdirected' + alliance (see alliance).
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Will class always be with us? Certainly mésalliance should be of historical interest by now.