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urban planning - the science of managing and directing city growth.
uranium - a heavy, radioactive metal (atomic number 92) used in the explosion of nuclear weapons (especially one isotope, U-235).
urban parks - parks in cities and areas of high population concentration.
utilities - companies (usually power distributors) permitted by a government agency to provide important public services (such as energy or water) to a region; as utilities are provided with a local monopoly, their prices are regulated by the permitting government agency.