English Dictionary - With Multi-Lingual Search

Of an item that is one of a pair, the other item in the pair.
(geometry) Of a regular polyhedron with V vertices and F faces, the regular polyhedron having F vertices and V faces.

(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.
(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.

(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 number, trial grammatical number. Modern Arabic displays a dual number, as did Homeric Greek.

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

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