Added 2 October 2026
dual
/ˈd͡ʒuː.əl/ adjective
In Latin: duālis Wiktionary
adjective Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about dual at Wordnik → Where our words come from →
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Characterized by having two (usually equivalent) components.
a dual-motor vehicle
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Pertaining to two, pertaining to a pair of.
dual engine failure
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Pertaining to a grammatical number in certain languages that refers to two of something, such as a pair of shoes.
Modern Arabic displays a dual number, as did Homeric Greek.
noun
- Of an item that is one of a pair, the other item in the pair.
-
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. The icosahedron is the dual of the dodecahedron.
- The dual number.
verb
- To convert from single to dual; specifically, to convert a single-carriageway road to a dual carriageway.
Origin
PIE word *dwóh₁ Borrowed from Latin dualis (“two”), from duo (“two”) + adjective suffix -alis.
From Wiktionary, via Kaikki.org (CC BY-SA)