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4 definitions found
 for dual
From The Collaborative International Dictionary of English v.0.48 :

  Dual \Du"al\, a. [L. dualis, fr. duo two. See Two.]
     Expressing, or consisting of, the number two; belonging to
     two; as, the dual number of nouns, etc., in Greek.
     [1913 Webster]
           Here you have one half of our dual truth. --Tyndall.
     [1913 Webster]

From WordNet (r) 3.0 (2006) :

      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,
             dual, 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,
         dual, twofold, two-fold, treble, threefold, three-
      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"

From Moby Thesaurus II by Grady Ward, 1.0 :

  43 Moby Thesaurus words for "dual":
     Janus-like, ambidextrous, bifacial, bifold, biform, bifurcated,
     bilateral, binary, binate, biparous, bipartisan, bipartite,
     bivalent, conduplicate, dichotomous, disomatous, double,
     double-barreled, double-faced, duadic, dualistic, duple, duplex,
     duplicate, duplicated, dyadic, geminate, geminated, identical,
     matched, paired, second, secondary, twain, twin, twinned, two,
     two-faced, two-level, two-ply, two-sided, two-story, twofold

From The Free On-line Dictionary of Computing (30 December 2018) :

      Every field of mathematics has a different
     meaning of dual.  Loosely, where there is some binary symmetry
     of a theory, the image of what you look at normally under this
     symmetry is referred to as the dual of your normal things.
     In linear algebra for example, for any vector space V, over
     a field, F, the vector space of linear maps from V to F is
     known as the dual of V.  It can be shown that if V is
     finite-dimensional, V and its dual are isomorphic (though no
     isomorphism between them is any more natural than any other).
     There is a natural embedding of any vector space in the dual
     of its dual:
         V -> V'': v -> (V': w -> wv : F)
     (x' is normally written as x with a horizontal bar above it).
     I.e. v'' is the linear map, from V' to F, which maps any w to
     the scalar obtained by applying w to v.  In short, this
     double-dual mapping simply exchanges the roles of function and
     It is conventional, when talking about vectors in V, to refer
     to the members of V' as covectors.

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