1 [attributive] consisting of two parts, elements, or aspects:their dual role at work and home dual-language texts in English and Italian Grammar (in some languages) denoting an inflection that refers to exactly two people or things (as distinct from singular and plural). (in an aircraft) using dual controls: a dual flight
(often dual to
) Mathematics (of a theorem, expression, etc.) related to another by the interchange of particular pairs of terms, such as ‘point’ and ‘line’.
1 Grammar a dual form of a word. [mass noun] the dual number.
2 Mathematics a theorem, expression, etc., that is dual to another.
convert (a road) into a dual carriageway: 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
- (also dualise) verb