dual
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