1.  suburbia(n = noun.location) suburb, suburban area - a residential district located on the outskirts of a city;
is a kind of community, residential area, residential district
is a part of fringe, outskirt
has particulars: addition, bedroom community, faubourg, stockbroker belt, wimbledon, clichy, clichy-la-garenne, orly, sun city
Derived form adjective suburban₁

2.  suburbia(n = noun.group) - suburbanites considered as a cultural class or subculture;
is a kind of subculture

suburbia, n. often derog. the suburbs, their inhabitants, and their way of life.