of, relating to, or being a marriage between a member of a royal or noble family and a person of inferior rank in which the rank of the inferior partner remains unchanged and the children of the marriage do not succeed to the titles, fiefs, or entailed property of the parent of higher rank

Pronunciation
morr-geh-NAT-ick

In a sentence:
When her morganatic marriage was announced, Annabelle’s father was furious–he threw plastic forks and spoons around while mechanically munching on cheap processed noodle snacks.

In a different sentence:
Robert’s distrusting and money-hungry parents insisted on a morganatic marriage for their biological son, and a “similar arrangement” for their adopted ethnic daughter.