noun
plural cities
[count] :a place where people live that is larger or more important than a town :an area where many people live and work
This sense is sometimes used in the name of a city.
[count] :the people in a city - usually singular
b the city :the government of a city
the City :the section of London that is Great Britain's financial and business center
[noncount] chiefly US informal - used to describe a place where there is a lot of a particular thing or activity
the big city
used to refer to a particular city without naming it