open marriage
noun
a marriage in which the partners agree that each is free to have sexual relationships with other partners.
Origin of open marriage
First recorded in 1970–75
Words nearby open marriage
open juncture,
open learning,
open letter,
open loop,
open market,
open marriage,
open mike,
open mind,
open one's eyes,
open one's heart to,
open one's mouth
British Dictionary definitions for open marriage
open marriage
noun
a marriage in which the partners are free to pursue their own social and sexual lives