Marriage

Marriage is a form of interpersonal relationship. Most often, it takes the form of a union between a man and a woman, however, other forms, such as polygyny (one man and more than one woman), polyandry (one woman and more than one man), and group marriage (any number of men, any number of women) exist.

Christianity

In most branches of Christianity, marriage is a life-long religious union between a man and a woman.

Mormonism

Historically, Mormonism has practiced polygyny. It stopped being a part of mainstream Mormonism in 1890, but some fringe groups still practice it.

Civil marriage

Civil marriage is a legal contract between two or more adults. It gives each member certain rights and obligations. Most commonly, these include power of attorney, inheritance rights, and rights in relation to any children they may have.