dual

Fetched 2026-10-26 (cache).

Datamuse reports no synonyms or antonyms for this word.

Adjective

1. Characterized by having [[two]] (usually equivalent) components.
2. Pertaining to [[two]], pertaining to a [[pair]] of.
3. {{lb|en|grammar}} Pertaining to a [[grammatical]] {{l|en|number|id=grammar}} in certain languages that refers to two of something, such as a pair of shoes.
4. {{lb|en|mathematics|physics}} Exhibiting [[duality]].
5. {{lb|en|linear algebra}} Being the space of all [[linear functional]]s of (some other space).
6. {{lb|en|category theory}} Being the [[dual#Noun|dual]] of some other category; containing the same objects but with source and target reversed for all [[morphisms]].

Noun

1. Of an item that is one of a pair, the other item in the pair.
2. {{senseid|en|geometry}}{{lb|en|geometry}} Of a [[regular]] [[polyhedron]] with ''V'' vertices and ''F'' faces, the regular polyhedron having ''F'' vertices and ''V'' faces.
3. {{lb|en|grammar}} The [[dual number]].
4. {{lb|en|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]].
5. {{lb|en|wrestling}} A head-to-head [[match]] or [[meet]] between two teams, such as two high schools or colleges.

Verb

1. {{lb|en|transitive}} To convert from single to dual; specifically, to convert a single-[[carriageway]] road to a [[dual carriageway]].

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.