Dual meaning

do͝oəl, dyo͝o-
Frequency:
Having a double character or purpose.

A belief in the dual nature of reality.

adjective
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The definition of dual is something that has to do with two or two parts.

An example of something dual is an electric toothbrush that both rotates and moves from side-to-side while it brushes your teeth; dual movement.

An example of something dual is a plan of attack that has two parts; dual plan of attack.

adjective
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Composed of two usually like or complementary parts; double.

Dual controls for pilot and copilot; a car with dual exhaust pipes.

adjective
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(grammar) Of, relating to, or being a number category that indicates two persons or things, as in Greek, Sanskrit, and Old English.
adjective
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The dual number.
noun
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Exhibiting duality; characterized by having two (usually equivalent) components.
adjective
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Acting as a counterpart.
adjective
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Double.

Dual-headed computer.

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

The octahedron is the dual of the cube.

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(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.
noun
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(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 grammatical number. Modern Arabic displays a dual number, as did Homeric Greek.
adjective
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An inflected form of a noun, adjective, pronoun, or verb used with two items or people.
noun
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Of two.
adjective
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Having or composed of two parts or kinds, like or unlike; double; twofold.

A dual nature.

adjective
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noun
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A word having dual number.
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(category theory)
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(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.
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Origin of dual

  • Latin duālis from duo two dwo- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • Latin dualis (“two”), from duo (“two”), + adjective suffix -alis

    From Wiktionary