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dual

From Wiktionary, the free dictionary

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See also: Dual, duel, and duál

English

English Wikipedia has an article on:
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Alternative forms

Etymology

More information PIE word ...

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

Pronunciation

Adjective

dual (not comparable)

  1. Characterized by having two (usually equivalent) components.
    Synonyms: double, twin; see also Thesaurus:dual
    a dual-motor vehicle
  2. 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.
    • 2021 March 15, Jessie Yeung, “These Asian countries are giving dual citizens an ultimatum on nationality – and loyalty”, in CNN‎:
      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.
  3. (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.
  4. (mathematics, physics) Exhibiting duality.
  5. (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.
  6. (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

The translations below need to be checked and inserted above into the appropriate translation tables. See instructions at Wiktionary:Entry layout § Translations.
Translations to be checked

Noun

dual (plural duals)

  1. Of an item that is one of a pair, the other item in the pair.
  2. (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.
  3. (grammar) The dual number.
  4. (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. (wrestling) A head-to-head match or meet between two teams, such as two high schools or colleges.
    • 2010 August 3, Kevin Revolinski, Insiders' Guide® to Madison, WI, Rowman & Littlefield, →ISBN, page 137:
      Wrestling duals and meets take place at the Wisconsin Field House. There are no advance single event ticket sales.
    • 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:
      But Dave agreed to participate in the Bulgarian dual, and that trapped me into having to wrestle, too.
    • 2023 October 19, Jason Norman, American Women in Amateur Wrestling, 2000-2022, McFarland, →ISBN, page 203:
      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.

Derived terms

Translations

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)

  1. (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

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French

Pronunciation

  • Audio (France (Toulouse)):(file)
  • Audio (France (Vosges)):(file)
  • Audio (France (Lyon)):(file)

Adjective

dual (feminine duale, masculine plural duaux, feminine plural duales)

  1. dual

Noun

dual m (plural duaux)

  1. dual

Further reading

German

Pronunciation

Adjective

dual (strong nominative masculine singular dualer, not comparable)

  1. dual

Declension

Positive forms of dual (uncomparable)
More information number & gender, singular ...

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)

  1. lock, tress
    Synonyms: dlaoi, dual gruaige
  2. wisp, tuft
    Synonym: dlaoi
  3. ply, strand
  4. twist, twine
  5. spiral, whirl
Declension
More information bare forms, singular ...
Derived terms

Verb

dual (present analytic dualann, future analytic dualfaidh, verbal noun dualadh, past participle dualta)

  1. (transitive) twine
  2. (transitive) braid, coil
  3. (transitive) interlace, fold
Conjugation
conjugation of dual (first conjugation – A)
More information verbal noun, past participle ...

* 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)

  1. dowel
  2. knot (in timber)
    Synonyms: alt, cranra
Declension
More information bare forms, singular ...
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)

  1. native, natural
    Is dual dó a bheith leisciúil. ― He is naturally lazy.
    Ní dual don diabhal bheith díomhaoin.
    No rest for the wicked.
    (literally, “It is not in the devil's nature to be idle.”)
  2. proper, fitting
  3. in the natural order of things
  4. fated
  5. possible
Declension
More information Positive, singular ...

1 When the preceding noun is lenited and governed by the definite article.
2 When the preceding noun ends in a slender consonant.

Mutation

More information radical, lenition ...

Note: Certain mutated forms of some words can never occur in standard Modern Irish.
All possible mutated forms are displayed for convenience.

Further reading

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Portuguese

Pronunciation

  • (Brazil) IPA(key): /duˈaw/ [dʊˈaʊ̯], (faster pronunciation) /ˈdwaw/ [ˈdwaʊ̯]
 

  • Rhymes: (Portugal) -al, (Brazil) -aw
  • Hyphenation: du‧al

Adjective

dual m or f (plural duais, not comparable)

  1. dual (having two elements)

Derived terms

Romanian

Etymology

Borrowed from French duel, from Latin dualis.

Noun

dual n (plural duale)

  1. (grammar) dual

Declension

More information singular, plural ...

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)

  1. hereditary
  2. usual, natural
    'S dual do phoileasman a bhith amharasach. ― It's natural for a policeman to be suspicious.
Derived terms

Noun

dual m (genitive singular duail, plural dualan)

  1. birthright
    Synonym: còir-bhreith
  2. due
  3. something which is natural and/or usual

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)

  1. curl, lock of hair
  2. plait, strand, braid, or fold
  3. ringlet

Verb

dual (past dhual, future dualidh, verbal noun dualadh, past participle dualte)

  1. plait, twist
  2. loop, curl
  3. fold
  4. link

Mutation

More information radical, lenition ...

Note: Certain mutated forms of some words can never occur in standard Scottish Gaelic.
All possible mutated forms are displayed for convenience.

References

  • MacBain, Alexander; Mackay, Eneas (1911), “dual”, in An Etymological Dictionary of the Gaelic Language‎, Stirling, →ISBN, page 145

Further reading

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Spanish

Etymology

From Latin duālis.

Pronunciation

  • IPA(key): /ˈdwal/ [ˈd̪wal]
  • Rhymes: -al
  • Syllabification: dual

Adjective

dual m or f (masculine and feminine plural duales)

  1. dual
  2. (grammar) dual

Derived terms

Further reading

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