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dual

See also: Dual, duel, and duál

Contents

EnglishEdit

Alternative formsEdit

  • (abbreviation, grammar): du.

EtymologyEdit

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

PronunciationEdit

  • (UK) enPR: dyo͞o'əl, djo͞o'əl; IPA(key): /ˈdjuː.əl/, /ˈdʒuː.əl/
  • (US) enPR: do͞o'əl, dyo͞o'əl; IPA(key): /ˈduː.əl/, /ˈdjuː.əl/
  • Audio (UK)
    		(file)
  • Rhymes: -ʊəl
  • Homophone: duel

AdjectiveEdit

dual (not comparable)

  1. Exhibiting duality; characterized by having two (usually equivalent) components.
  2. Acting as a counterpart.
  3. Double.
    dual-headed computer
  4. (grammar) Pertaining to grammatical number (as in singular and plural), referring to two of something, such as a pair of shoes, in the context of the singular, plural and in some languages, trial grammatical number. Modern Arabic displays a dual number, as did Homeric Greek.
  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 9781461224044, 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 domain and codomain reversed for all functions.
    • 1992, Colin McLarty, Elementary Categories, Elementary Toposes, Clarendon Press ISBN 9780191589492, page 77
      Every category is dual to its own dual, so if a statement holds in all categories so does its dual.

Derived termsEdit

SynonymsEdit

TranslationsEdit

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.
Translations to be checked

NounEdit

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) dual number The grammatical number of a noun marking two of something (as in singular, dual, plural), sometimes referring to two of anything (a couple of, exactly two of), or a chirality-marked pair (as in left and right, as with gloves or shoes) or in some languages as a discourse marker, "between you and me". A few languages display trial 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.

See alsoEdit

TranslationsEdit

AnagramsEdit

IrishEdit

PronunciationEdit

Etymology 1Edit

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 tægel, English tail).

NounEdit

dual m (genitive singular duail, nominative plural duail)

  1. lock, tress
  2. wisp, tuft
  3. ply, strand
  4. twist, twine
  5. spiral, whirl
DeclensionEdit
Declension of dual

First declension

Bare forms:

Case Singular Plural
Nominative dual duail
Vocative a dhuail a dhuala
Genitive duail dual
Dative dual duail

Forms with the definite article:

Case Singular Plural
Nominative an dual na duail
Genitive an duail na ndual
Dative leis an dual

don dual

 leis na duail
SynonymsEdit
Derived termsEdit

VerbEdit

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

  1. to twine
  2. to braid, coil
  3. to interlace, fold
ConjugationEdit
First Conjugation (A)
singular plural relative autonomous
first second third first second third
indicative present dualaim dualann tú;
dualair†		 dualann sé, sí dualaimid dualann sibh dualann siad;
dualaid†		 a dhualann; a dhualas /
a ndualann*; a ndualas*		 dualtar
past dhual mé; dhualas dhual tú; dhualais dhual sé, sí dhualamar; dhual muid dhual sibh; dhualabhair dhual siad; dhualadar a dhual /
ar dhual*		 dualadh
past habitual dhualainn dhualtá dhualadh sé, sí dhualaimis; dhualadh muid dhualadh sibh dhualaidís; dhualadh siad a dhualadh /
ar dhualadh*		 dhualtaí
future dualfaidh mé;
dualfad		 dualfaidh tú;
dualfair†		 dualfaidh sé, sí dualfaimid;
dualfaidh muid		 dualfaidh sibh dualfaidh siad;
dualfaid†		 a dhualfaidh; a dhualfas /
a ndualfaidh*; a ndualfas*		 dualfar
conditional dhualfainn dhualfá dhualfadh sé, sí dhualfaimis; dhualfadh muid dhualfadh sibh dhualfaidís; dhualfadh siad a dhualfadh /
ar dhualfadh*		 dhualfaí
subjunctive present go nduala mé;
go ndualad†		 go nduala tú;
go ndualair†		 go nduala sé, sí go ndualaimid;
go nduala muid		 go nduala sibh go nduala siad;
go ndualaid†		 — go ndualtar
past dá ndualainn dá ndualtá dá ndualadh sé, sí dá ndualaimis;
dá ndualadh muid		 dá ndualadh sibh dá ndualaidís;
dá ndualadh siad		 — dá ndualtaí
imperative dualaim dual dualadh sé, sí dualaimis dualaigí;
dualaidh†		 dualaidís — dualtar
verbal noun dualadh
past participle dualta

* Indirect relative
† Dialect form

Etymology 2Edit

  This entry lacks etymological information. If you are familiar with the origin of this term, please add it to the page per etymology instructions. You can also discuss it at the Etymology scriptorium.

NounEdit

dual m (genitive singular duail, nominative plural duail)

  1. dowel
  2. knot (in timber)
DeclensionEdit
Declension of dual

First declension

Bare forms:

Case Singular Plural
Nominative dual duail
Vocative a dhuail a dhuala
Genitive duail dual
Dative dual duail

Forms with the definite article:

Case Singular Plural
Nominative an dual na duail
Genitive an duail na ndual
Dative leis an dual

don dual

 leis na duail
SynonymsEdit
Derived termsEdit

Etymology 3Edit

From Proto-Indo-European *dʰewgʰ-.

AdjectiveEdit

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
DeclensionEdit
Declension of dual
First Declension
Singular Plural (m/f)
Positive Masculine Feminine (strong noun) (weak noun)
Nominative dual dual¹ duala³
Vocative duail¹ dual¹ duala
Genitive duail¹ duaile duala dual
Dative dual² dual¹;
(archaic) duail¹		 duala³
Comparative duaile

¹ This form is lenited after a noun if possible.
² This form is lenited if possible when the preceding noun is lenited and governed by the definite article.
³ This form is lenited if possible when the preceding noun ends in a slender consonant.

MutationEdit

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.

PortugueseEdit

AdjectiveEdit

dual m, f (plural duais, comparable)

  1. dual (having two elements)

Scottish GaelicEdit

NounEdit

dual m (genitive singular duail, plural dualan)

  1. birthright

SynonymsEdit

Derived termsEdit

NounEdit

dual m (genitive singular duail, plural dualan)

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

AdjectiveEdit

dual (comparative nas duaile)

  1. hereditary,
  2. usual, natural

SpanishEdit

AdjectiveEdit

dual (plural duales)

  1. dual
  2. (grammar) dual
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