Definition: (adjective) Of or being a legal marriage between a person of royal or noble birth and a partner of lower rank, in which it is agreed that no titles or estates of the royal or noble partner are to be shared by the partner of inferior rank nor by any of the offspring of the marriage.
Synonyms: left-handed.
Usage: Lola Montes, a dancer, became the morganatic wife of King Louis of Bavaria and was created Countess of Landsfeld.
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Source: The Free Dictionary