noun
a person (not necessarily a spouse) with whom you cohabit and share a long-term sexual relationship
• Syn: ↑significant other, ↑spousal equivalent, ↑spouse equivalent
• Hyponyms: ↑lover, ↑spouse, ↑partner, ↑married person, ↑mate, ↑better half
* * *
noun, pl ⋯ -ners [count]
US formal : a person you live with and have a sexual relationship with but are not married to
◇ Domestic partner is usually used in legal situations.
The organization is trying to get tax and insurance benefits for domestic partners.
domestic partnership noun, pl ⋯ -ships [count]
People in domestic partnerships qualify for insurance benefits.
Useful english dictionary. 2012.