a marriage between spouses who live apart, usually because of the locations of their jobs, and who regularly travel to be together, as on weekends.
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British Dictionary definitions for commuter marriage
a marriage in which the partners live some distance apart most of the time, usually because of separate work commitments
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