dyad

/หˆdaษช.รฆd/
noun
  1. 1

    A set of two elements treated as one; a pair.

  2. 2

    Any set of two different pitch classes.

  3. 3

    A pair of things standing in particular relation; dyadic relation.

    โ€œ"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. 20โ€

  4. 4

    An element, atom, or radical having a valence or combining power of two.

  5. 5

    A secondary unit of organisation consisting of an aggregate of monads.

  6. 6

    A tensor of order two and rank one.

Synonyms

Source: https://en.wiktionary.org/wiki/dyad