Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: dualis, from duo 'two'

dual

 adjective
     
du‧al [only before noun]
having two of something or two parts
dual role/purpose/function
The bridge has a dual role, carrying both road and rail.
a dual system of education
dual citizenship/nationality
She has dual nationality, of Canada and Britain (=she is a citizen of Canada and Britain).
—duality noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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