Definition of POSSLQ in English:

POSSLQ

Pronunciation /ˈpäsəlˌkyo͞o/ /ˈpɑsəlˌkju/

abbreviation

informal, dated US
  • A person of the opposite sex with whom one lives as part of an established unmarried couple.

    spouse, husband, wife, mate, consort

Origin

1970s short for person of the opposite sex sharing living quarters; apparently coined by a member of the US Census Bureau but never officially adopted.