domestic partner

English Thesaurus

1. a person (not necessarily a spouse) with whom you cohabit and share a long-term sexual relationship (noun.person)

hypernym	:	individual, mortal, person, somebody, someone, soul,
definition	:	a human being (noun.tops)

hyponym	:	lover,
definition	:	a significant other to whom you are not related by marriage (noun.person)

hyponym	:	better half, married person, mate, partner, spouse,
definition	:	a person's partner in marriage (noun.person)