WORLD MIGRATION REPORT 2015 Migrants and Cities: New Urban Partnerships to Manage Mobility
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SECONDARY CITY
A secondary city is largely determined by population, size, function and economic status. The population of secondary cities ranges between 10 to 50 per cent of a country’s largest city. They will likely constitute a subnational or sub-metropolitan second-tier level of government, acting as centres for public administration and delivery of education, knowledge, health, community, and security services; an industrial centre or development growth pole; a new national capital; or a large city making up a cluster of smaller cities in a large metropolitan region.
SENDING COUNTRY
A country from which a number of residents depart to settle abroad, permanently or temporarily.
SLUM
A heavily populated urban informal settlement characterized by poverty, substandard housing and squalor.
SQUATTER SETTLEMENT
Areas where people have built their own houses on land that does not belong to them and for which they have no legal authorization, lease or building permit, and usually built without following building and planning regulations. See also: Informal Settlement.
SOUTH
Refers to upper-middle-income, lower-middle-income and low-income countries, as classified by the World Bank.
SOUTH–SOUTH MIGRATION
South–South migration refers to the movement of people across international boundaries within and between low- and middle-income countries.
TRANSIT CITY
A city where migrants stop over on their way from origin countries to the ultimate destination country.
URBAN
The definition of “urban” varies from country to country, and, with periodic reclassification, can also vary within a country over time, making direct comparisons difficult. An urban area can be defined by one or more of the following: administrative criteria or political boundaries (e.g. area within the jurisdiction of a municipality or town committee); a threshold population size (where the minimum for an urban settlement is typically in the region of 2,000 people, although this varies globally between 200 and 50,000), population density; economic function (e.g. where a significant majority of the population is not primarily engaged in agriculture or where there is surplus employment), or the presence of urban characteristics (e.g. paved streets, electric lighting, sewerage). In 2010, 3.5 billion people lived in areas classified as urban.
URBAN AGGLOMERATION
The population of a built-up or densely populated area containing the city proper, suburbs and continuously-settled commuter areas or adjoining territory inhabited at urban levels of residential density. Large urban agglomerations often include several administratively distinct but functionally linked cities. For example, the urban agglomeration of Tokyo includes the cities of Chiba, Kawasaki, Yokohama and others.