Definition of "metroplex"

The collection of small urban centers and the multinucleated metropolitan subcenters is the twenty-first-century metroplex that provides citizens with opportunities to develop different lifestyles in new environmental settings. In the metroplex the new arrivals do not have to abandon their careers or interests.

1984, Jack Meltzer, Metropolis to Metroplex: The Social and Spatial Planning of Cities, Johns Hopkins University Press, page 14