dyad

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dyad (plural dyads)

A set of two different elements.
- 1908, W. D. Ross, Metaphysics, translation of original by Aristotle:
  
  ... positing a dyad and constructing the infinite out of great and small, instead of treating the infinite as one, is peculiar to him; ...
(music) any set of two different pitch classes.
A pair of things standing in particular relation; dyadic relation.
- "For each individual in a specific dyad (i.e., mother-offspring, offspring-father, sibling-sibling),..." Debra Lieberman, John Tooby, and Leda Cosmides - The evolution of human incest avoidance mechanisms: an evolutionary psychological approach, p. 20

a set of two different elements

music: any set of two different pitch classes