metropolis

Short definition from Wiktionary

Noun

1. 1
   The mother (founding) polis (city state) of a colony.
2. 2
   A large, busy city, especially as the main city in an area or country or as distinguished from surrounding rural areas.
3. 3
   The see of a metropolitan bishop, ranking above its suffragan diocesan bishops.
4. 4
   A generic focus in the distribution of plants or animals.

Proper noun

1. 1
   A city, the county seat of Massac County, Illinois, United States.
2. 2
   A ghost town in Elko County, Nevada, United States.
3. 3
   A classical city site in Anatolia (Turkey).
4. 4
   A fictional city serving as the primary setting for the Superman franchise, published by DC Comics.
5. 5
   Nickname for New York City: a major city in New York, United States.
6. 6
   Nickname for London: the capital city of the United Kingdom; the capital city of England, within Greater London.