Definition of a city

Rules
The word "city" can reffer to several different things, therefor this page is here to clarify what what term means.

A settlement is a place where people live, this is probably the purest definition of the word "city".

An urban area is the total area used up by buildings and associated infrastructure.

A national subdivision is an entity within a country that is lower than the state, such as a State in the US, or a prefecture in Japan.

A remote subdivision must have a population of at least 15,000 to be counted as a subdivision of your nation.

Every urban area needs to be at least two kilometers apart. You can have an unlimited amount of subdivisions inside an urban area, although these subdivisions must at least have a population of 50,000 people. A subdivision can be smaller, but only if it is the only subdivision in the area of two kilometers.