noun A person, other than a spouse, with whom one cohabits.
Usage Note: Many people would now agree that a couple can consist of persons living together who are not married or who are not of opposite sexes. How to refer to such a couple, though, has posed an interesting challenge. Many new words have been coined and tested over the last 25 years, including
spouse-equivalent or
spousal equivalent; POSSLQ (person of the opposite sex sharing living quarters), pronounced (pŏsˈəl-kyo͞oˌ) and originally used as a U.S. Census Bureau designation; and
companion or
lifelong (or
longtime)
companion. But these have never been in or have fallen out of general use. Thus the linguistic situation seems to reflect the continuing flux of the social situation. • Two other terms,
significant other and
domestic partner, however, have seen widespread use since at least 1985 as all-purpose words for describing a spouse or a lover. Over 75 percent of Usage Panelists feel these terms can be applied to members of either straight or gay couples.
Domestic partner has been used by an increasing number of companies and organizations in drafting benefits plans that include all members of such relationships. The term is often shortened to
partner, especially in unofficial situations.