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English definition of “dual”

dual

adjective [before noun] uk   /ˈdjuː.əl/ us    /ˈduː.əl/
C1 with two parts, or combining two things: This room has a dual purpose, serving as both a study and a dining room. the dual role of chairman and chief executiveSingle, double and multiple dual controls two sets of controls in a car, one for the person who is learning to drive and one for the teacherThe interior of vehicles dual nationality/citizenship the nationality of two countries at the same time: She has dual British and American nationality.Country and nationContinents and regions of the worldCountry names
(Definition of dual from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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