Dictionary

dual en · ADJ

Pronunciation

• /ˈdul/ (General-American)
• dyo͞oʹəl (Received-Pronunciation)
• d(y)o͞o'əl (General-American)
• jo͞oʹəl (Received-Pronunciation)
• /ˈd(j)u.əl/ (General-American)
• (UK) audio
• /ˈdjuː.əl/ non-yod-coalescence
• /ˈd͡ʒuː.əl/ yod-coalescence

Etymology

PIE word *dwóh₁ Borrowed from Latin dualis (“two”), from duo (“two”) + adjective suffix -alis.

Meanings

1. (not-comparable) Characterized by having two (usually equivalent) components.
   • a dual-motor vehicle
2. (not-comparable) Pertaining to two, pertaining to a pair of.
   • dual citizenship
   • Both Deborah and Samuel held dual roles as judges and prophets. 2020, Grace Ying May, “Women Disciplining Men: A Biblical Pattern of Leadership”, in Aída Besançon Spencer, William David Spencer, editors, Christian Egalitarian Leadership: Empowering the Whole Church According to the Scriptures, page 48:
   • And some Asian countries are tightening their immigration laws. Japan reinforced its strict stance in January when a court upheld the country’s ban against dual citizenship, rejecting a lawsuit filed by Japanese citizens living in Europe. 2021 March 15, Jessie Yeung, “These Asian countries are giving dual citizens an ultimatum on nationality – and loyalty”, in CNN:
   • dual engine failure
3. (not-comparable) Pertaining to a grammatical number in certain languages that refers to two of something, such as a pair of shoes.
   • Modern Arabic displays a dual number, as did Homeric Greek.
4. (not-comparable) Exhibiting duality.
5. (not-comparable) Being the space of all linear functionals of (some other space).
   • 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, page 81:
6. (not-comparable) Being the dual of some other category; containing the same objects but with source and target reversed for all morphisms.
   • 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, page 77:

Forms

Coordinates

singular · plural · trial

Deriveds

dual offence · dual monastery · dual house · non-self-dual · dualie · dual mandate · isodual · dual-clutch gearbox · nondual · dual nationality · dual-band · dual-voltage · dualism · Hodge dual · dual-ported · duloxetine · dual career couple · dual-SIM · dual sensory impaired · dual resident · dual-edged sword · dual graph · dualisation · dual phenomenology · dual polyhedron · dual citizen · dual earner couple · dual primary · dual-mode · dual-use research of concern · pseudodual · dual audio · dual-exceptional · dual citizenship · dual-purpose · dual-energy X-ray absorptiometry · dual-frequency · dual boot · dual SIM · dual photon absorptiometry · dualic · dualski · dual heritage · dual active galactic nuclei · dual control · dualize · dualist · dual-sector model · dual mode · coduality · dual cab · dual economy · dual earner · dual earner family · dual-capable aircraft · dual meet · dual-coding theory · codual · dual tone multi-frequency · dual wield · dualization · dually · dual-lens reflex · bidual · dual-boot · duality · dual degree · dual federalism · dual-braked · dual school · dual-use · predual · dualistic · dual-tropic

Hypernyms

plural

Hyponyms

bipartible · dyadic · bipartile · dimerous · duplex · bipartite

Synonyms

twofold · opposite · dual · twofold · binary · twin · double · twin · double · double · duplicate · dual · twissel · duple · duplicate · duplex · double · twosome

Translations (87)

tr ikil (in grammar) · grc δυϊκός (in grammar) · id dual (in grammar) · hu kettős (having two components) · pt dual (having two components) · nl tweevouds- (in grammar) · la duālis (having two components) · fi kaksi- (double) · nl tweeledig (having two components) · fi kaksikko- (in grammar) · hu duális (in grammar) · sv två- (double) · vo telnumik (in grammar) · es dual (double) · cy deuol (having two components) · ru дво́йственный (in grammar) · fr duel (having two components) · id dwi (having two components) · pl dwoisty (having two components) · hi द्विवचन (in grammar) · eo duala (having two components) · ca dual (having two components) · ar مُثَنًّى (in grammar) · sl dvojen (having two components) · fi duaalinen (in grammar) · ru дуа́лис (in grammar) · eo duparta (having two components) · ru дво́йственный (having two components) · tr tesniye (in grammar) · hu kettős (in grammar) · sv dubbel- (double) · gv dooblit (double) · nv naakigo (in grammar) · cy deuol (double) · cs duálový (in grammar) · pl podwójny (having two components) · cmn 雙數 /双数 (in grammar) · eo duobla (double) · bg двоен (double) · he זוגי (in grammar) · nl dubbel- (double) · fi duaali- (in grammar) · bg двойствен (in grammar) · it doppio (having two components) · ca doble (double) · fi kaksois- (having two components) · pl podwójna (in grammar) · nan-hbl 雙數 /双数 (in grammar) · fi kaksi- (having two components) · yue 雙數 /双数 (in grammar) · ru двойно́й (double) · cy dwbl (double) · fr double (double) · fr double (having two components) · fr dual (having two components) · it duale (having two components) · de dual (in grammar) · afb دَبَل (double) · pl podwójny (double) · ru сдво́енный (double) · ru двойно́й (having two components) · bg от две части (having two components) · nl dualis- (in grammar) · id ganda (double) · sl dvojinski (in grammar) · fi kaksinkertainen (double) · eo binara (having two components) · es dual (in grammar) · afb مُثَنَّى (in grammar) · fr duel (in grammar) · sl dvojen (double) · pt duplo (double) · hy երկակի (in grammar) · pal dw (in grammar) · fi duaalinen (having two components) · ar مُثَنًّى (double) · ja 双数 (in grammar) · pt dual (in grammar) · sv dual (in grammar) · es dual (having two components) · eo duobla (having two components) · tr çift (double) · fi duaali- (having two components) · ru двоя́кий (double) · tl dalawahan (in grammar) · th ทวิพจน์ (in grammar) · gv dooblit (having two components)

dual en · NOUN

Pronunciation

• /ˈdul/ (General-American)
• dyo͞oʹəl (Received-Pronunciation)
• d(y)o͞o'əl (General-American)
• jo͞oʹəl (Received-Pronunciation)
• /ˈd(j)u.əl/ (General-American)
• (UK) audio
• /ˈdjuː.əl/ non-yod-coalescence
• /ˈd͡ʒuː.əl/ yod-coalescence

Etymology

PIE word *dwóh₁ Borrowed from Latin dualis (“two”), from duo (“two”) + adjective suffix -alis.

Meanings

1. Of an item that is one of a pair, the other item in the pair.
2. 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. The icosahedron is the dual of the dodecahedron.
3. The dual number.
4. 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. A head-to-head match or meet between two teams, such as two high schools or colleges.
   • Early in 2021, she became the first female to compete and win a match at the Ter-Hark Cup wrestling dual, helping her squad to victory. 2023 October 19, Jason Norman, American Women in Amateur Wrestling, 2000-2022, McFarland, →ISBN, page 203:
   • Wrestling duals and meets take place at the Wisconsin Field House. There are no advance single event ticket sales. 2010 August 3, Kevin Revolinski, Insiders' Guide® to Madison, WI, Rowman & Littlefield, →ISBN, page 137:
   • But Dave agreed to participate in the Bulgarian dual, and that trapped me into having to wrestle, too. 2014 November 18, Mark Schultz, David Thomas, Foxcatcher: The True Story of My Brother's Murder, John du Pont's Madness, and the Quest for Olympic Gold, Penguin, →ISBN:

Forms

Deriveds

third-person dual · self-dual · second-person dual · first-person dual · categorical dual

Relateds

duel · unal

Translations (39)

hu kettős szám (grammatical number of a noun marking two of something) · sl dvojina (grammatical number of a noun marking two of something) · lt dviskaita (grammatical number of a noun marking two of something) · de Zweizahl (grammatical number of a noun marking two of something) · hsb dwojota (grammatical number of a noun marking two of something) · nl dualis (grammatical number of a noun marking two of something) · el δυϊκός αριθμός (grammatical number of a noun marking two of something) · sv dualis (grammatical number of a noun marking two of something) · nv nizhdiltʼéhígo (grammatical number of a noun marking two of something) · sh dvojìna (grammatical number of a noun marking two of something) · de Dual (grammatical number of a noun marking two of something) · ru дво́йственное число́ (grammatical number of a noun marking two of something) · cs dvojné číslo (grammatical number of a noun marking two of something) · sh двојѝна (grammatical number of a noun marking two of something) · grc δυϊκόν (grammatical number of a noun marking two of something) · pt dual (grammatical number of a noun marking two of something) · fi kaksikko (grammatical number of a noun marking two of something) · pl liczba podwójna (grammatical number of a noun marking two of something) · hy երկակի թիվ (grammatical number of a noun marking two of something) · ga déach (grammatical number of a noun marking two of something) · hy երկակի (grammatical number of a noun marking two of something) · vo telnum (grammatical number of a noun marking two of something) · sgs dvėskaita (grammatical number of a noun marking two of something) · hsb dwójba (grammatical number of a noun marking two of something) · hu duális (grammatical number of a noun marking two of something) · fo tvítal (grammatical number of a noun marking two of something) · cs duál (grammatical number of a noun marking two of something) · ar مُثَنَّى (grammatical number of a noun marking two of something) · nb dualis (grammatical number of a noun marking two of something) · uk двоїна́ (grammatical number of a noun marking two of something) · fi duaali (grammatical number of a noun marking two of something) · lv divskaitlis (grammatical number of a noun marking two of something) · bg двойствено число (grammatical number of a noun marking two of something) · nl tweevoud (grammatical number of a noun marking two of something) · nb totall (grammatical number of a noun marking two of something) · ja 双数形 (grammatical number of a noun marking two of something) · fr duel (grammatical number of a noun marking two of something) · th ทวิพจน์ (grammatical number of a noun marking two of something) · da dualis (grammatical number of a noun marking two of something)

dual en · VERB

Pronunciation

• /ˈdul/ (General-American)
• dyo͞oʹəl (Received-Pronunciation)
• d(y)o͞o'əl (General-American)
• jo͞oʹəl (Received-Pronunciation)
• /ˈd(j)u.əl/ (General-American)
• (UK) audio
• /ˈdjuː.əl/ non-yod-coalescence
• /ˈd͡ʒuː.əl/ yod-coalescence

Etymology

PIE word *dwóh₁ Borrowed from Latin dualis (“two”), from duo (“two”) + adjective suffix -alis.

Meanings

1. (transitive) To convert from single to dual; specifically, to convert a single-carriageway road to a dual carriageway.
   • 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. 2006, David Lowe, Intermodal Freight Transport, page 163:
   • The investment will allow Nexus to increase service frequencies, reduce journey times, and improve reliability by dualling three sections of line between Pelaw and South Shields. 2021 September 22, “Network News: Nexus increases Tyne and Wear Metro train order to 46”, in RAIL, number 940, page 23:
   • 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. 1994, Great Britain. Parliament. House of Commons, Parliamentary Debates:

Forms