Polis, plural poleis, means ‘city’ in ancient Greek. The modern Greek word πόλη (polē) is a direct descendant of the ancient word and roughly means "city" or an urban place. However, the Ancient Greek term that specifically meant the totality of urban buildings and spaces was asty (ἄστυ), rather than polis.

A city is a human settlement of a notable size. The term "city" has different meanings around the world and in some places the settlement can be very small. Even where the term is limited to larger settlements, there is no universally agreed definition of the lower boundary for their size. In a more narrow sense, a city can be defined as a permanent and densely settled place with administratively defined boundaries whose members work primarily on non-agricultural tasks. Cities generally have extensive systems for housing, transportation, sanitation, utilities, land use, production of goods, and communication. Their density facilitates interaction between people, government organizations, and businesses, sometimes benefiting different parties in the process, such as improving the efficiency of goods and service distribution.