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/ˈdjuː.əl/ · dual
noun
- Of an item that is one of a pair, the other item in the pair. The other shoe is the dual of the one I'm wearing.
- 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.
noun
- 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'. Some languages use the dual number to indicate a pair of objects.
verb
- To convert from single to dual; specifically, to convert a single-carriageway road to a dual carriageway. The road was dualled to improve traffic flow.
adjective
- Exhibiting duality; characterized by having two (usually equivalent) components. The dual processor in the computer allowed for faster performance.
- Acting as a counterpart. The dual of the hero is the villain.
- Double. A dual-headed computer has two processors.
Did you know? The concept of duality has been explored in mathematics, philosophy, and literature, often symbolizing the coexistence of opposing forces or ideas.