dyad

About 0.69 uses per million words.

Meaning

noun A set of two elements treated as one; a pair.
noun Two persons in an ongoing relationship; a dyadic relationship.
noun The relationship or interaction itself in reference to a couple.
noun Any set of two different pitch classes.
noun An element, atom, or radical having a valence of or combining power of two.
noun A chromosome structure, usually X- or V-shaped, consisting of two condensed sister chromatids joined by a centromere.
noun A secondary unit of organisation consisting of an aggregate of monads.
noun A tensor of order two and rank one.