• Dual approach
• Dual carriageway
• Dual chamber waterbed
• Dual citizenship
• Dual diagnosis
• Dual diarchy
• Dual focus
• Dual function
• Dual icosahedron
• Dual identity
• Dual language
• Dual nationality
• Dual of a zonohedron
• Dual of an icosidodecahedron
• Dual of the icosadodecahedron
• Dual personality
• Dual polyhedron
• Dual polyhedron of the triacontahedron
• Dual processor
• Dual purpose