adjective

consisting of two parts, elements, or aspects.

their dual role at work and home

double,twofold,binary,duplicate,duplex,twin,matched,matching,paired,in pairs,coupled,binate

noun

a dual form of a word.

verb

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