Characterized by having two (usually equivalent) components.
Synonyms:double, twin; see also Thesaurus:dual
a dual-motor vehicle
Pertaining to two, pertaining to a pair of.
Synonyms:double, duplicate; see also Thesaurus:twofold
dual engine failure
dual citizenship
(grammar) Pertaining to a grammatical number in certain languages that refers to two of something, such as a pair of shoes.
Coordinate terms:singular, trial, plural
Modern Arabic displays a dual number, as did Homeric Greek.
(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.
Synonym:opposite
Derived terms
Translations
Noun
dual (pluralduals)
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.
(Can we clean up(+) this sense?)(grammar) The dual 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”, in Trésor de la langue française informatisé[Digitized Treasury of the French Language], 2012.
German
Pronunciation
IPA(key): [duˈaːl]
Hyphenation: du‧al
Rhymes: -aːl
Adjective
dual (strong nominative masculine singulardualer, not comparable)
dual
Declension
Further reading
“dual” in Duden online
“dual” in Digitales Wörterbuch der deutschen Sprache
Irish
Pronunciation
IPA(key): /d̪ˠuəl̪ˠ/, /d̪ˠuəlˠ/
Etymology 1
From Old Irishdúal(“tress, lock of hair”), from Proto-Celtic*doklos, from Proto-Indo-European*doḱlos (compare Icelandictagl(“horse’s tail”), Old Englishtæġl, Englishtail).