Etymology
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mesalliance (n.)

also misalliance, "marriage with a person of lower social position," 1782, from French mésalliance, from pejorative prefix mes- (from Latin mis-; see mis-) + alliance (see alliance). In English form misalliance from 1738.

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misalliance (n.)

"marriage with a person of lower social position,"  1738, from mis- (1) "bad, wrong" + alliance. Compare mesalliance.

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