Etymology

metamour

met·a·mour
M3E1T1A1M3O1U1R1

Today it means: In a polyamorous relationship, one's partner's partner, with whom one is not directly involved. Full definition →

English paramourinflu. ← French amourinflu. ← Middle English amour
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The story

  1. Proto-Indo-European*me
  2. Proto-Indo-European*meth₂?
  3. Ancient Greekμετᾰ́ (metắ)
  4. Ancient Greekμετᾰ- (metă-)
  5. Englishmeta-
  6. Proto-Indo-European*h₃emh₃-
  7. Proto-Italic*amāō
  8. Latinamō
  9. Latinamōrem
  10. Old Frenchamor
  11. Middle Frenchamour
  12. Middle Englishamour
  13. Frenchamourinflu.
  14. Englishamour
  15. Englishparamourinflu.
  16. English todaymetamour

From meta- (“transcending”) + amour (“lover”), likely influenced by paramour.

Etymology from Wiktionary, CC BY-SA 4.0.