ETYM Cf. French agglomération.
A jumbled collection or mass.
The clustering of activities or people at specific points or areas; for example, at a route center. Firms or individuals that cluster together can often share facilities and services, resulting in lower costs (agglomeration economies, including economy of scale).

ETYM New Lat., from Greek megalopolis; megas, megale, great + polis city.
A very large urban complex (usually involving several cities and towns).
Vast city.