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Dyad

//ˈdaɪ.æd// noun

Definitions

Noun
  1. 1
    A set of two elements treated as one; a pair.

    "[…] positing a dyad and constructing the infinite out of great and small, instead of treating the infinite as one, is peculiar to him; […]"

  2. 2
    two items of the same kind wordnet
  3. 3
    Two persons in an ongoing relationship; a dyadic relationship.

    "For each individual in a specific dyad (i.e., mother-offspring, offspring-father, sibling-sibling), […]"

  4. 4
    The relationship or interaction itself in reference to a couple.
  5. 5
    Any set of two different pitch classes.
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  1. 6
    An element, atom, or radical having a valence of or combining power of two.
  2. 7
    A chromosome structure, usually X- or V-shaped, consisting of two condensed sister chromatids joined by a centromere.
  3. 8
    A secondary unit of organisation consisting of an aggregate of monads.
  4. 9
    A tensor of order two and rank one.

Etymology

From Ancient Greek δυάς (duás), δυάδ- (duád-) from δύο (dúo, “two”), from Proto-Indo-European *duwó, *duwéh₃ (*dwóh₁). The mathematics sense was coined by American scientist Josiah Willard Gibbs in 1884 in the second half of his book Elements of Vector Analysis.

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