dyad.
A set of two elements treated as one; a pair.
Meaning & usage
A set of two elements treated as one; a pair.
Two persons in an ongoing relationship; a dyadic relationship.
The relationship or interaction itself in reference to a couple.
Any set of two different pitch classes.
An element, atom, or radical having a valence of or combining power of two.
A chromosome structure, usually X- or V-shaped, consisting of two condensed sister chromatids joined by a centromere.
A secondary unit of organisation consisting of an aggregate of monads.
A tensor of order two and rank one.
Where this word comes from
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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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.