A union or connection of interests between families, states, parties, etc., especially between families by marriage and states by compact, treaty, or league.
Marriage.
The persons or parties allied.
The state of being allied.
The act of allying or uniting.
Any union resembling that of families or states; union by relationship in qualities; affinity.
A legal union similar to marriage, established to allow same-sex couples (and, in some jurisdictions, opposite-sex couples) rights similar to those married couples have.