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