English

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Person B is in a relationship with both person A and person C, but persons A and C are not in a relationship with each other.

Etymology

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From the V shape of a diagram of the relationship: a triangle with one side missing.

Noun

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V triad (plural V triads)

  1. A triad in which one person is in a polyamorous relationship with two other people who are not in a relationship with each other.