Example: The marriage of music and dance.
A marriage of ideas.
source: wordnet30
The act of marrying, or the state of being married; legal union of a man and a woman for life, as husband and wife; wedlock; matrimony.(noun)
source: webster1913
In bézique, penuchle, and similar games at cards, the combination of a king and queen of the same suit. If of the trump suit, it is called a royal marriage.(noun)