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From tri- +‎ (mo)nogamous. Compare trigamous.


trinogamous ‎(not comparable)

  1. (colloquial) Pertaining to a committed relationship involving three people, often including a married couple.
    • 2006, The Hollywood Reporter, vol. 395:
      And we mus[t]n't forget "Three of Hearts," a feature-length documentary about the nine- year "trinogamous" relationship among bisexual men Sam Cagnina and Steven Margolis and heterosexual woman Samantha Singh.
    • 2013, Donn Cortez, Investigating CSI: Inside the Crime Labs of Las Vegas, Miami and New York, BenBella Books, Inc. (ISBN 9781935251576), page 233
      When a man is shot dead on the sidewalk, two women claim to be his wife. Mac, Stella, and dr. hawkes soon discover that the trio were involved in a trinogamous relationship that might not have been as happy as the widows claim.