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.
[New Latin morganāticus, from Medieval Latin (mātrimōnium ad) morganāticam, (marriage for the) morning-gift, of Germanic origin.]
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Indo-European & Semitic Roots Appendices
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