Characterized by having two (usually equivalent) components. / Pertaining to two, pertaining to a pair of.

Of an item that is one of a pair, the other item in the pair. / (geometry) Of a regular polyhedron with V vertices and F faces, the regular polyhedron having F vertices and V faces.

(transitive) To convert from single to dual; specifically, to convert a single-carriageway road to a dual carriageway.

simple past tense and past participle of dual

Alternative form of dualling

plural of dual

plural of dual earner

(economics) person of a couple with two jobs and thus two incomes; they may or may not have children.

(rail transport, of an electric train) Able to run using two different voltages, depending on the voltage supplied to the particular railway line, whether by third rail direct current or overhead wires.

(graph theory) A graph derived from some plane graph in such a way that the derived graph has a vertex corresponding to each face of the given graph, an edge corresponding to each edge of the given graph that is shared by a pair of distinct faces, and a self-loop for each edge of the given graph that is a border of the same face on both of its sides.