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[pos-uh l-kyoo]
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noun, plural POSSLQs, POSSLQ's.
  1. either of two persons, one of each sex, who share living quarters but are not related by blood, marriage, or adoption: a categorization used by the U.S. Census Bureau.
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Origin of POSSLQ

p(erson of the) o(pposite) s(ex) s(haring) l(iving) q(uarters)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for posslq


1979, acronym from person of opposite sex sharing living quarters; it never was an official category.

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Online Etymology Dictionary, © 2010 Douglas Harper