A male-female marriage entered into in the hope of concealing the non-heterosexual sexual orientation of one or both of the spouses.

Equality and equal acceptance (particularly legal acceptance, but also social acceptance) of same-sex in addition to heterosexual marriages.

Used other than figuratively or idiomatically: see equal, marriage. / Marriage equality; the acceptance of same-sex as well as heterosexual marriages.

The state of being marred or spoilt. / (Northern England, rare) Of a person, the state of being marred or cosseted.

(vulgar, offensive, derogatory) Same-sex marriage.

Marriage with a dead person or between dead people.

(archaic) third-person singular simple present indicative form of mar

(archaic) second-person singular simple present form of mar

(historical) A long-term monogamous relationship between two unmarried women, especially in New England between the 18th and early 20th centuries.

(derogatory, slang) Synonym of same-sex marriage