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- Dictionarydual/ˈdjuːəl/
adjective
- 1. consisting of two parts, elements, or aspects: "their dual role at work and home"
- 2. (of a theorem, expression, etc.) related to another by the interchange of particular pairs of terms, such as ‘point’ and ‘line’.
noun
- 1. a dual form of a word.
- 2. a theorem, expression, etc., that is dual to another.
verb
- 1. convert (a road) into a dual carriageway: British "though there are no plans to dual the road, a public consultation on the A64 is set to start before the end of the year"
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