dual

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See also: Dual, duel, and duál

English[edit]

English Wikipedia has an article on:
Wikipedia

Alternative forms[edit]

  • du. (abbreviation, grammar)

Etymology[edit]

PIE word
*dwóh₁

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

Pronunciation[edit]

Adjective[edit]

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, editor, Christian Egalitarian Leadership: Empowering the Whole Church According to the Scriptures, page 48:
      Both Deborah and Samuel held dual roles as judges and prophets.
  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[edit]

Translations[edit]

The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Wiktionary:Entry layout § Translations.

Noun[edit]

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. (Can we clean up(+) this sense?) (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.

Translations[edit]

See also[edit]

Verb[edit]

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, p. 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[edit]


French[edit]

Adjective[edit]

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

  1. dual

Noun[edit]

dual m (plural duaux)

  1. dual

Further reading[edit]


German[edit]

Pronunciation[edit]

Adjective[edit]

dual (strong nominative masculine singular dualer, not comparable)

  1. dual

Declension[edit]

Further reading[edit]

  • dual” in Duden online
  • dual” in Digitales Wörterbuch der deutschen Sprache

Irish[edit]

Pronunciation[edit]

Etymology 1[edit]

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[edit]

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[edit]
Derived terms[edit]

Verb[edit]

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[edit]

Etymology 2[edit]

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

Noun[edit]

dual m (genitive singular duail, nominative plural duail)

  1. dowel
  2. knot (in timber)
    Synonyms: alt, cranra
Declension[edit]
Derived terms[edit]

Etymology 3[edit]

From Old Irish dúal (that which belongs or is proper to an individual by nature or descent), from Proto-Indo-European *dʰewgʰ-.

Adjective[edit]

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.
    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[edit]

Mutation[edit]

Irish mutation
Radical Lenition Eclipsis
dual dhual ndual
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

Further reading[edit]


Portuguese[edit]

Pronunciation[edit]

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

Adjective[edit]

dual m or f (plural duais, not comparable)

  1. dual (having two elements)

Derived terms[edit]


Romanian[edit]

Etymology[edit]

From French duel, from Latin dualis.

Noun[edit]

dual n (plural duale)

  1. (grammar) dual

Declension[edit]


Scottish Gaelic[edit]

Etymology 1[edit]

From Old Irish dúal (that which belongs or is proper to an individual by nature or descent), from Proto-Indo-European *dʰewgʰ-.

Pronunciation[edit]

Adjective[edit]

dual (comparative duaile)

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

Noun[edit]

dual m (genitive singular duail, plural dualan)

  1. birthright
    Synonym: còir-bhreith
  2. due
  3. something which is natural and/or usual
Derived terms[edit]

Etymology 2[edit]

From Old Irish dúal (tress, lock of hair), from Proto-Celtic *doklos, from Proto-Indo-European *doḱlos.

Noun[edit]

dual m (genitive singular duail, plural dualan)

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

Verb[edit]

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

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

Mutation[edit]

Scottish Gaelic mutation
Radical Lenition
dual dhual
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

References[edit]

Further reading[edit]


Spanish[edit]

Etymology[edit]

From Latin duālis.

Pronunciation[edit]

Adjective[edit]

dual (plural duales)

  1. dual
  2. (grammar) dual

Derived terms[edit]

Further reading[edit]