A marriage based on the duration of cohabitation rather than formal ceremony.

A form of polygynous, polyandrous marriage in which more than one man and more than one woman form a family unit.

plural of marra

(West Cumbria, Tyneside, Mackem, informal) A friend, pal, buddy, mate.

Suitable for marriage; nubile.

One who is suitable for marriage.

Marriage between people of different socially-distinguished groups, such as different races, cultures or religions.

(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.