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open marriage

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noun
  1. a marriage in which the partners agree that each is free to have sexual relationships with other partners.
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Origin of open marriage

First recorded in 1970–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for open marriage

open marriage

noun
  1. a marriage in which the partners are free to pursue their own social and sexual lives
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012