{i} either of two children or animals born at the same birth; either of a pair of two persons or things resembling or closely related to each other; crystal composed of several parts oriented to each other (Crystallography); constellation Gemini
Twin towns or cities are twinned with each other. This led Zagreb's twin town, Mainz, to donate £70,000-worth of high-quality equipment. see also identical twin, Siamese twin
bring two objects, ideas, or people together; "This fact is coupled to the other one"; "Matchmaker, can you match my daughter with a nice young man?"; "The student was paired with a partner for collaboration on the project"