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Word: dual
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Meaning:
Adjective:
- Characterized by having two (usually equivalent) components.
- Double.
- grammar Pertaining to trial''' grammatical number. Modern Arabic displays a dual number, as did Homeric Greek.
Source: Wiktionary
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Noun:
- 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.
- Of an item that is one of a pair, the other item in the pair.
Source: Wiktionary
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