dual

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English [edit]

Etymology [edit]

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

Pronunciation [edit]

Adjective [edit]

dual (not comparable)

  1. Characterized by having two (usually equivalent) components.
  2. Double.
    dual-headed computer
  3. (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.
  4. (linear algebra) This word needs a definition. Please help out and add a definition, then remove the text {{rfdef}}.
  5. (category theory) This word needs a definition. Please help out and add a definition, then remove the text {{rfdef}}.

Derived terms [edit]

Translations [edit]

having two components
double
in grammar
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 Help:How to check translations.
Translations to be checked

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. (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 also [edit]

Translations [edit]

grammatical number of a noun marking two of something

Anagrams [edit]

Irish [edit]

Pronunciation [edit]

  • IPA: [d̪ˠuəl̪ˠ]

Etymology 1 [edit]

From Old Irish dúal (“tress, lock of hair”), from Proto-Celtic *doklo-, from Proto-Indo-European *dok̑-lo- (compare Icelandic tagl (“horse's tail”), Old English tægel, English tail).

Noun [edit]

dual m (genitive duail, nominative plural duail)

  1. lock, tress
  2. wisp, tuft
  3. ply, strand
  4. twist, twine
  5. spiral, whirl
Declension [edit]
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
Synonyms [edit]
Derived terms [edit]

Verb [edit]

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

  1. to twine
  2. to braid, coil
  3. to interlace, fold
Conjugation [edit]
First Conjugation (A)
singular plural autonomous
first second third first second third
indicative present dualaim dualann tú;
dualair†		 dualann sé, sí dualaimid dualann sibh dualann siad;
dualaid†		 dualtar
past dhual mé;
dhualas†		 dhual tú;
dhualais†		 dhual sé, sí dhualamar dhual sibh;
dhualabhair†		 dhual siad;
dhualadar†		 dualadh
future dualfaidh mé;
dualfad†		 dualfaidh tú;
dualfair†		 dualfaidh sé, sí dualfaimid;
dualfam†		 dualfaidh sibh dualfaidh siad;
dualfaid†		 dualfar
past habitual dhualainn dhualtá dhualadh sé, sí dhualaimis dhualadh sibh dhualaidís dhualtaí
imperative dualaim dual dualadh sé, sí dualaimis dualaigí dualaidís dualtar
conditional dhualfainn dhualfá dhualfadh sé, sí dhualfaimis dhualfadh sibh dhualfaidís dhualfaí
subjunctive present duala mé;
dualad†		 duala tú;
dualair†		 duala sé, sí dualaimid duala sibh duala siad;
dualaid†		 dualtar
past dualainn dualtá dualadh sé, sí dualaimis dualadh sibh dualaidís dualtaí
verbal noun dualadh
past participle dualta

† Dialect form

Etymology 2 [edit]

EB1911 - Volume 01 - Page 001 - 1.svg This entry lacks etymological information. If you are familiar with the origin of this term, please add it to the page as described here.

Noun [edit]

dual m (genitive duail, nominative plural duail)

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

Etymology 3 [edit]

EB1911 - Volume 01 - Page 001 - 1.svg This entry lacks etymological information. If you are familiar with the origin of this term, please add it to the page as described here.

Adjective [edit]

dual

  1. native, natural
    Is dual dó a bheith leisciúil. — He is naturally lazy.
  2. proper, fitting
  3. in the natural order of things
  4. fated
  5. possible
Declension [edit]
Declension of dual
First Declension
Singular Plural (m/f)
Positive masc. fem. (strong noun) (weak noun)
Nominative dual duala
Vocative duail dual duala
Genitive duail duaile duala dual
Dative dual duala
Comparative duaile

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.

Scottish Gaelic [edit]

Noun [edit]

dual m (genitive duail, plural dualan)

  1. birthright

Synonyms [edit]

Derived terms [edit]

Spanish [edit]

Adjective [edit]

dual m and f (plural duales)

  1. dual
  2. (grammar) dual
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