different between tetrachord vs dyad

English

Etymology

tetra- +? chord

Noun

tetrachord (plural tetrachords)

1. (music) Any set of four different pitch classes.
2. (music) A series of four sounds, forming a scale of two-and-a-half tones.

Related terms

• interval
• dyad
• trichord
• hexachord
• tetrachordo

English

Etymology

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

Pronunciation

• IPA^(key): /?da?.æd/
• Rhymes: -a?æd

Noun

dyad (plural dyads)

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

   Synonyms: couple, duad; see also Thesaurus:duo
2. (sociology) Two persons in an ongoing relationship; dyadic relationship.
   • "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
3. (sociology) The relationship or interaction itself in reference to a couple.
4. (music) Any set of two different pitch classes.
5. (chemistry) An element, atom, or radical having a valence of or combining power of two.
6. (biology) A chromosome structure, usually X- or V-shaped, consisting of two condensed sister chromatids joined by a centromere.
7. (biology) A secondary unit of organisation consisting of an aggregate of monads.
8. (mathematics) A tensor of order two and rank one.

Coordinate terms

• (group) monad, duad/dyad, triad, tetrad, pentad, hexad, heptad, octad, ennead/nonad, decad/decade, hendecad, dodecad/duodecade, chiliad

Derived terms

• dyadic
• dyadwise
• dyadically
• dyadism
• pseudodyad

Translations

See also

• interval
• trichord
• hexachord
• tetrachord

References

Anagrams

• Addy, D-Day, Dady, addy