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English
Alternative forms
- du. (abbreviation, grammar)
Etymology
Borrowed from Latin dualis (“two”), from duo (“two”) + adjective suffix -alis.
Pronunciation
Adjective
dual (not comparable)
- 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
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:Both Deborah and Samuel held dual roles as judges and prophets.
- (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).
2012, Doug Fisher, Hans-J. Lenz, Learning from Data: Artificial Intelligence and Statistics V, Springer Science & Business Media, →ISBN, page 81:Accordingly, a hyperplane in the sample space is dual to a subspace in the variable 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
1992, Colin McLarty, Elementary Categories, Elementary Toposes, Clarendon Press, →ISBN, page 77:Every category is dual to its own dual, so if a statement holds in all categories so does its dual.
Derived terms
Translations
having two components
- Bulgarian: от две части (ot dve časti)
- Catalan: dual (ca)
- Dutch: tweeledig (nl)
- Esperanto: duparta, duala, duobla (eo), binara (eo)
- Finnish: (in compounds) kaksi- (fi), kaksois- (fi), duaalinen, duaali- (fi)
- French: double (fr) m or f, duel (fr) m, dual (fr)
- Hungarian: kettős (hu)
- Indonesian: dwi (id)
- Italian: duale (it), doppio (it)
- Latin: duālis
- Manx: dooblit
- Polish: dwoisty (pl), podwójny (pl)
- Portuguese: dual (pt)
- Russian: двойно́й (ru) (dvojnój), дво́йственный (ru) (dvójstvennyj)
- Slovene: dvojen (sl)
- Spanish: doble (es), dual (es)
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Translations to be checked
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.
- (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.
Derived terms
Translations
grammatical number of a noun marking two of something
See also
Verb
dual (third-person singular simple present duals, present participle (UK) dualling or (US) dualing, simple past and past participle (UK) dualled or (US) dualed)
- (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.
2006, David Lowe, Intermodal Freight Transport, page 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.
2021 September 22, “Network News: Nexus increases Tyne and Wear Metro train order to 46”, in RAIL, number 940, page 23: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.
Anagrams
French
Pronunciation
Adjective
dual (feminine duale, masculine plural duaux, feminine plural duales)
- dual
Noun
dual m (plural duaux)
- dual
Further reading
German
Pronunciation
Adjective
dual (strong nominative masculine singular dualer, not comparable)
- dual
Declension
Positive forms of dual (uncomparable)
Further reading
- “dual” in Duden online
- “dual” in Digitales Wörterbuch der deutschen Sprache
Irish
Pronunciation
- IPA(key): /d̪ˠuəl̪ˠ/, /d̪ˠuəlˠ/
Etymology 1
From Old Irish dúal (“tress, lock of hair”), from Proto-Celtic *doklos, from Proto-Indo-European *doḱlos (compare Icelandic tagl (“horse’s tail”), Old English tæġl, English tail).
Noun
dual m (genitive singular duail, nominative plural duail)
- lock, tress
- Synonyms: dlaoi, dual gruaige
- wisp, tuft
- Synonym: dlaoi
- ply, strand
- twist, twine
- spiral, whirl
Declension
Derived terms
Verb
dual (present analytic dualann, future analytic dualfaidh, verbal noun dualadh, past participle dualta)
- (transitive) twine
- (transitive) braid, coil
- (transitive) interlace, fold
Conjugation
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singular
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plural
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relative
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autonomous
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first
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second
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third
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first
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second
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third
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indicative
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present
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dualaim
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dualann tú; dualair†
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dualann sé, sí
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dualaimid
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dualann sibh
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dualann siad; dualaid†
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a dhualann; a dhualas / a ndualann*; a ndualas*
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dualtar
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past
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dhual mé; dhualas
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dhual tú; dhualais
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dhual sé, sí
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dhualamar; dhual muid
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dhual sibh; dhualabhair
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dhual siad; dhualadar
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a dhual / ar dhual*
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dualadh
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past habitual
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dhualainn / ndualainn‡‡
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dhualtá / ndualtᇇ
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dhualadh sé, sí / ndualadh sé, s퇇
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dhualaimis; dhualadh muid / ndualaimis‡‡; ndualadh muid‡‡
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dhualadh sibh / ndualadh sibh‡‡
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dhualaidís; dhualadh siad / ndualaidís‡‡; ndualadh siad‡‡
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a dhualadh / a ndualadh*
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dhualtaí / ndualta퇇
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future
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dualfaidh mé; dualfad
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dualfaidh tú; dualfair†
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dualfaidh sé, sí
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dualfaimid; dualfaidh muid
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dualfaidh sibh
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dualfaidh siad; dualfaid†
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a dhualfaidh; a dhualfas / a ndualfaidh*; a ndualfas*
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dualfar
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conditional
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dhualfainn / ndualfainn‡‡
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dhualfá / ndualfᇇ
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dhualfadh sé, sí / ndualfadh sé, s퇇
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dhualfaimis; dhualfadh muid / ndualfaimis‡‡; ndualfadh muid‡‡
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dhualfadh sibh / ndualfadh sibh‡‡
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dhualfaidís; dhualfadh siad / ndualfaidís‡‡; ndualfadh siad‡‡
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a dhualfadh / a ndualfadh*
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dhualfaí / ndualfa퇇
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subjunctive
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present
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go nduala mé; go ndualad†
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go nduala tú; go ndualair†
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go nduala sé, sí
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go ndualaimid; go nduala muid
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go nduala sibh
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go nduala siad; go ndualaid†
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—
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go ndualtar
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past
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dá ndualainn
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dá ndualtá
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dá ndualadh sé, sí
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dá ndualaimis; dá ndualadh muid
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dá ndualadh sibh
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dá ndualaidís; dá ndualadh siad
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—
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dá ndualtaí
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imperative
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dualaim
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dual
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dualadh sé, sí
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dualaimis
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dualaigí; dualaidh†
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dualaidís
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—
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dualtar
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verbal noun
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dualadh
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past participle
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dualta
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* indirect relative
† archaic or dialect form
‡‡ dependent form used with particles that trigger eclipsis
Etymology 2
(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)
Noun
dual m (genitive singular duail, nominative plural duail)
- dowel
- knot (in timber)
- Synonyms: alt, cranra
Declension
Derived terms
Etymology 3
From Old Irish dúal (“that which belongs or is proper to an individual by nature or descent”), from Proto-Indo-European *dʰewgʰ-.
Adjective
dual (genitive singular masculine duail, genitive singular feminine duaile, plural duala, comparative duaile)
- native, natural
- Is dual dó a bheith leisciúil. ― He is naturally lazy.
- proper, fitting
- in the natural order of things
- fated
- possible
Declension
¹ When the preceding noun is lenited and governed by the definite article.
² When the preceding noun ends in a slender consonant.
Related terms
Mutation
Irish mutation
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Radical
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Lenition
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Eclipsis
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dual
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dhual
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ndual
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Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.
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Further reading
- Ó Dónaill, Niall (1977), “dual”, in Foclóir Gaeilge–Béarla, Dublin: An Gúm, →ISBN
- G. Toner, M. Ní Mhaonaigh, S. Arbuthnot, D. Wodtko, M.-L. Theuerkauf, editors (2019), “1 dúal”, in eDIL: Electronic Dictionary of the Irish Language
- G. Toner, M. Ní Mhaonaigh, S. Arbuthnot, D. Wodtko, M.-L. Theuerkauf, editors (2019), “2 dúal”, in eDIL: Electronic Dictionary of the Irish Language
- Entries containing “dual” in English-Irish Dictionary, An Gúm, 1959, by Tomás de Bhaldraithe.
- Finck, F. N. (1899) Die araner mundart (in German), volume II, Marburg: Elwert’sche Verlagsbuchhandlung, page 72
- Entries containing “dual” in New English-Irish Dictionary by Foras na Gaeilge.
Portuguese
Pronunciation
- Rhymes: (Portugal) -al, (Brazil) -aw
- Hyphenation: du‧al
Adjective
dual m or f (plural duais, not comparable)
- dual (having two elements)
Derived terms
Romanian
Etymology
Borrowed from French duel, from Latin dualis.
Noun
dual n (plural duale)
- (grammar) dual
Declension
Scottish Gaelic
Etymology 1
From Old Irish dúal (“that which belongs or is proper to an individual by nature or descent”), from Proto-Indo-European *dʰewgʰ-.
Pronunciation
Adjective
dual (comparative duaile)
- hereditary
- usual, natural
- 'S dual do phoileasman a bhith amharasach. ― It's natural for a policeman to be suspicious.
Noun
dual m (genitive singular duail, plural dualan)
- birthright
- Synonym: còir-bhreith
- due
- something which is natural and/or usual
Derived terms
Etymology 2
From Old Irish dúal (“tress, lock of hair”), from Proto-Celtic *doklos, from Proto-Indo-European *doḱlos.
Noun
dual m (genitive singular duail, plural dualan)
- curl, lock of hair
- plait, strand, braid, or fold
- ringlet
Verb
dual (past dhual, future dualidh, verbal noun dualadh, past participle dualte)
- plait, twist
- loop, curl
- fold
- link
Mutation
Scottish Gaelic mutation
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Radical
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Lenition
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dual |
dhual
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Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.
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References
Further reading
- G. Toner, M. Ní Mhaonaigh, S. Arbuthnot, D. Wodtko, M.-L. Theuerkauf, editors (2019), “1 dúal”, in eDIL: Electronic Dictionary of the Irish Language
- G. Toner, M. Ní Mhaonaigh, S. Arbuthnot, D. Wodtko, M.-L. Theuerkauf, editors (2019), “2 dúal”, in eDIL: Electronic Dictionary of the Irish Language
Spanish
Etymology
From Latin duālis.
Pronunciation
- IPA(key): /ˈdwal/
- Rhymes: -al
- Syllabification: dual
Adjective
dual m or f (masculine and feminine plural duales)
- dual
- (grammar) dual
Derived terms
Related terms
Further reading