What is the meaning of Dyad?

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

Two persons in an ongoing relationship; 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.

Source: wiktionary.org