(US, informal) cohabitation, civil union / (US, informal) gay marriage

A marriage in which a widow marries her late husband's brother in order to maintain the family community.

A marriage in which a husband engages in marriage or sexual relations with the sister of his wife, usually after the death of his wife, or once his wife has proven infertile.

A marriage in which the partners decide not to have children, and to reserve the right to divorce amicably with mutual consent.

A counsellor who gives advice to married couples regarding their relationship or family life.

A marriage performed by a government official instead of by a member of the clergy.

Marriage between two people of the same sex.

(historical) An alleged form of execution during the French Revolution in which a man and woman were tied together naked, exposed to public view for a time in this condition, and then stabbed, shot, or thrown into a body of water to drown.

(poker slang) A king and a queen of the same suit as a starting hand in Texas hold 'em (see marriage)

A marriage motivated by some reason other than love; especially one conducted to obtain entry or residence rights in a country.