• IPA: /ˈdaɪ.æd/

dyad (plural dyads)

  1. A set of two elements treated as one; a pair.
    Synonyms: couple, duad, Thesaurus:duo
  2. (music) Any set of two different pitch classes.
  3. 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
  4. (chemistry) An element, atom, or radical having a valence or combining power of two.
  5. (biology) A secondary unit of organisation consisting of an aggregate of monads.
  • Portuguese: díade
  • Russian: диада

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