dual

Definition from Wiktionary, a free dictionary

Contents 1 English 1.1 Etymology 1.2 Pronunciation 1.3 Adjective 1.3.1 Derived terms 1.3.2 Translations 1.4 Noun 1.4.1 See also 1.4.2 Translations 2 Irish 2.1 Etymology 2.2 Pronunciation 2.3 Noun 2.3.1 Declension 2.3.2 Mutation

[edit] English

[edit] Etymology

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

[edit] Pronunciation

• (RP) dyo͝oəl, /djʊəl/, /djU@l/
• (US) do͞o'əl, /ˈduəl/, /"du@l/

  Rhymes: -ʊəl

• Homophones: duel

[edit] Adjective

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.

[edit] Derived terms

• duality
• dualism

[edit] Translations

• Indonesian: ganda, dwi, dual
• Interlingua: dual
• Latin: dualis
• Romanian: dual

[edit] 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) 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.

[edit] See also

[edit] Translations

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[edit] Irish

[edit] Etymology

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

[edit] Pronunciation

• IPA: [d̪ˠuəl̪ˠ]

[edit] Noun

dual m.

1. tuft

[edit] Declension

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

[edit] Mutation

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.