suburb, a community in an outlying section of a city or, more commonly, a nearby, politically separate municipality with social and economic ties to the central city. In the 20th cent., particularly in the United States, population growth in urban areas has spilled increasingly outside the city limits and concentrated there, resulting in large metropolitan areas where the populations of the suburbs taken together exceed that of the central city.
sub·di·vi·sion
n.
1. An act or instance of subdividing (obtain approval of his subdivision of the land)
2. A tract of land subdivided into lots (to provide streets and sewers for the subdivision)
3. A part made by subdividing (as prescribed in subdivision one of this section)