city

A city is a town of significant size or an urban area with self-government. (noun)

An example of a city is Manhattan.

See city in Webster's New World College Dictionary

noun pl. cities

a center of population larger or more important than a town or village
in the U.S., an incorporated municipality whose boundaries and powers of self-government are defined by a charter from the state in which it is located
in Canada, any of various large urban municipalities within a province
in Great Britain, a borough or town with a royal charter, usually a town that has been or is an episcopal see
all of the people of a city
in ancient Greece, a city-state

adjective

of, in, for, or characteristic of a city

See city in American Heritage Dictionary 4

(sĭtˈē)

noun pl. cit·ies

A center of population, commerce, and culture; a town of significant size and importance.
a. An incorporated municipality in the United States with definite boundaries and legal powers set forth in a charter granted by the state.
b. A Canadian municipality of high rank, usually determined by population but varying by province.
c. A large incorporated town in Great Britain, usually the seat of a bishop, with its title conferred by the Crown.
The inhabitants of a city considered as a group.
An ancient Greek city-state.
Slang Used in combination as an intensive: The playing field was mud city after the big rain.
City The financial and commercial center of London. Used with the.