dual

noun

(wrestling) A head-to-head match or meet between two teams, such as two high schools or colleges.

Of an item that is one of a pair, the other item in the pair.

(geometry) Of a regular polyhedron with V vertices and F faces, the regular polyhedron having F vertices and V faces.

(mathematics) Of a vector in an inner product space, the linear functional corresponding to taking the inner product with that vector. The set of all duals is a vector space called the dual space.

(grammar) The dual number.

verb

(transitive) To convert from single to dual; specifically, to convert a single-carriageway road to a dual carriageway.

adjective

Characterized by having two (usually equivalent) components.

Pertaining to two, pertaining to a pair of.

(grammar) Pertaining to a grammatical number in certain languages that refers to two of something, such as a pair of shoes.

(mathematics, physics) Exhibiting duality.

(linear algebra) Being the space of all linear functionals of (some other space).

(category theory) Being the dual of some other category; containing the same objects but with source and target reversed for all morphisms.

Roots

duodu- · Latin · two

Synonyms for dual

dupleadj doubleadj twofoldadj twinadj geminatedn twon bipartiteadj

Synonyms & related words for dual

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Words related to dual

Explore words related to dual — words associated with it, words that go with it, and its nearest matches in meaning. Related words include dually, threefold, binal, treble, triple, multi, duality, bifarious. Click any word to make it the center of the map and keep exploring the web of connections.

Synonyms for dual

Common synonyms for dual include duple, double, twofold, twin, geminated, two, bipartite — words that share a close meaning. Hover or tap any word on the map for its definition and part of speech.

Where does dual come from?

The word dual breaks down into one root of Latin origin: the root du-, from Latin duo (“two”). Explore each root to see other English words built from the same source.