borough

noun

1. 1.A fortified town.
2. 2.A town or city.
3. 3.A town having a municipal corporation and certain traditional rights.
4. 4.An administrative district in some cities, e.g., London.
5. 5.An administrative unit of a city which, under most circumstances according to state or national law, would be considered a larger or more powerful entity; most commonly used in American English to define the five counties that make up New York City.