Pronunciation
- (British) enPR: dyo͞o'əl, djo͞o'əl; IPA: /ˈdjuː.əl/, /ˈdʒuː.əl/
- (America) enPR: d(y)o͞o'əl; IPA: /ˈd(j)uː.əl/
dual (not comparable)
- Exhibiting duality; characterized by having two (usually equivalent) components.
- Acting as a counterpart.
- Double.
- a dual-headed computer
- (grammar) Pertaining to grammatical number (as in singular and plural), referring to two of something, such as a pair of shoes, in the context of the singular, plural and, in some languages, trial grammatical number.
- Modern Arabic displays a dual number, as did Homeric Greek.
- (linear algebra) Being the space of all linear functionals of (some other space).
- 2012, Doug Fisher, Hans-J. Lenz, Learning from Data: Artificial Intelligence and Statistics V, Springer Science & Business Media ISBN 9781461224044, page 81
- Accordingly, a hyperplane in the sample space is dual to a subspace in the variable space.
- 2012, Doug Fisher, Hans-J. Lenz, Learning from Data: Artificial Intelligence and Statistics V, Springer Science & Business Media ISBN 9781461224044, page 81
- (category theory) Being the dual#Noun|dual of some other category; containing the same objects but with source and target reversed for all morphisms.
- 1992, Colin McLarty, Elementary Categories, Elementary Toposes, Clarendon Press ISBN 9780191589492, page 77
- Every category is dual to its own dual, so if a statement holds in all categories so does its dual.
- 1992, Colin McLarty, Elementary Categories, Elementary Toposes, Clarendon Press ISBN 9780191589492, page 77
- (having two components) double, twin; see also Thesaurus:dual
- (double) double, duplicate; see also Thesaurus:twofold
- (category theory) opposite
- French: double, duel, dual
- Italian: duale, doppio
- Portuguese: dual
- Russian: двойно́й
- Spanish: doble, dual
dual (plural duals)
- 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.
- The octahedron is the dual of the cube.
- (grammar) dual number The grammatical number of a noun marking two of something (as in singular, dual, plural), sometimes referring to two of anything (a couple of, exactly two of), or a chirality-marked pair (as in left and right, as with gloves or shoes) or in some languages as a discourse marker, "between you and me". A few languages display trial number.
- (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.
dual (duals, present participle dualling; past and past participle dualled)
- (transitive) To convert from single to dual; specifically, to convert a single-carriageway road to a dual carriageway.
- 1994, Great Britain. Parliament. House of Commons, Parliamentary Debates
- I have to declare an interest and I do so with some ambivalence because if the road is dualled it is likely to take half of my front garden.
- 1998, Great Britain. Parliament. House of Commons, Parliamentary Debates
- Way back in 1971, the Government of the day first published plans for a high-capacity road network, which included the dualling of the A47 from King's Lynn to Great Yarmouth.
- 2006, David Lowe, Intermodal Freight Transport, p. 163
- The power generation and propulsion systems are dualled to accommodate component failure and maintain propulsion at reduced speed should any part of one system be lost.
- 1994, Great Britain. Parliament. House of Commons, Parliamentary Debates
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