AskDefine | Define dual

Dictionary Definition

dual adj
1 consisting of or involving two parts or components usually in pairs; "an egg with a double yolk"; "a double (binary) star"; "double doors"; "dual controls for pilot and copilot"; "duple (or double) time consists of two (or a multiple of two) beats to a measure" [syn: double, duple]
2 having more than one decidedly dissimilar aspects or qualities; "a double (or dual) role for an actor"; "the office of a clergyman is twofold; public preaching and private influence"- R.W.Emerson; "every episode has its double and treble meaning"-Frederick Harrison [syn: double, twofold, treble, threefold]
3 a grammatical number category referring to two items or units as opposed to one item (singular) or more than two items (plural); "ancient Greek had the dual form but it has merged with the plural form in modern Greek"

User Contributed Dictionary



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


  • (RP): dyo͝oəl, , /djU@l/
  • (US): do͞o'əl, , /"du@l/
    Rhymes: -ʊəl



dual (no or )
  1. Characterized by having two (usually equivalent) components.
  2. Double.
    dual-headed computer
  3. 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.


having two components
in grammar
Translations to be checked


dual (plural: duals)
  1. Of an item that is one of a pair, the other item in the pair.
  2. Of a regular polyhedron with V vertices and F faces, the regular polyhedron having F vertices and V faces.
    The tetrahedron is the dual of the cube.
  3. 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. 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.

Related terms



From dúal < < (cf. Icelandic tagl, Old English tægel, English tail).


  • lang=ga|[d̪ˠuəl̪ˠ]


  1. tuft



Extensive Definition

Dual may refer to:
  • a pair or a grouping of two:
    • dual number, a grammatical construct in some languages
    • dual troll, a secondary account on an internet message board
    • dual fertilization, simultaneous application of a P-type and N-type fertilizer
    • dual diagnosis, a psychiatric diagnosis of co-occurrence of substance abuse and a mental problem
    • DUAL table, a special kind of one-row and one-column database table
  • a proper name:
    • Dual, a manufacturer of Hifi equipment
    • Dual!, an anime series
dual in German: Dual
dual in French: Dual
dual in Polish: Dual

Synonyms, Antonyms and Related Words

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