Definition of "dual"
adjective:
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Characterized by having two (usually equivalent) components.
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Double.
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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.
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noun:
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Of an item that is one of a pair, the other item in the pair.
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Of a regular polyhedron with V vertices and F faces, the regular polyhedron having F vertices and V faces.
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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.
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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.
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