dual

Pronunciation

Adjective

Noun

Verb

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Pronunciation

- (
*British*) enPR: dyo͞o'əl, djo͞o'əl; IPA: /ˈdjuː.əl/, /ˈdʒuː.əl/ - (
*America*) enPR: d(y)o͞o'əl; IPA: /ˈd(j)uː.əl/

Adjective

**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.

- Accordingly, a hyperplane in the sample space is

- (
*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.

- Every category is

- (
*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

Noun

**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.

Verb

**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.

- I have to declare an interest and I do so with some ambivalence because if the road is
**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.

- Way back in 1971, the Government of the day first published plans for a high-capacity road network, which included the
**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.

- The power generation and propulsion systems are

This text is extracted from the Wiktionary and it is available under the CC BY-SA 3.0 license | Terms and conditions | Privacy policy 0.023