morganatic marriage
n. A marriage between a person of royal birth and a partner of lower rank, in which the latter has no royal status or title.

Example Citation:
"It may be that many people in Britain would not seriously object to Charles marrying Camilla.... That being so, what should Camilla's status be? Our constitutional law, rightly, does not admit morganatic marriage."
—Paul Johnson, "Don't they deserve a break now?," The Daily Mail (London)

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