| Term | Definition |
|---|
| Activity space | The area where activities take place. |
| Brain drain | Large-scale emigration by talented people. |
| Chain migration (migration ladder) | Migration of people to a specific location because relatives or members of the same nationality previously migrated there. |
| Circulation | Short-term, repetitive, or cyclical movements that occur on a regular basis. |
| Counterurbanization | Net migration from urban to rural areas in more developed countries. |
| Distance decay function | The diminishing in importance and eventual disappearance of a phenomenon with increasing distance from its origin. |
| Emigration | Migration from a location. |
| Immigration | Migration to a location. |
| Floodplain | The area subject to flooding during a given number of years according to historical trends. |
| Forced migration | Permanent movement compelled usually by cultural factors. |
| Voluntary migration | Permanent movement undertaken by choice. |
| Gravity model | A model that holds that the potential use of a service at a particular location is directly related to the number of people in a location and inversely related to the distance people must travel to reach the service. |
| Guest workers | Workers who migrate to the more developed countries of Northern and Western Europe, usually from Southern of Eastern Europe or from North Africa, in search of higher-paying jobs. |
| Internal migration | Permanent movement within a particular country. |
| International migration | Permanent movement from one country to another. |
| Intraregional migration | Permanent movement within one region of a country. |
| Interregional migration | Permanent movement from one region of a country to another. |
| Intervening obstacle | An environmental or cultural feature of the landscape that hinders migration. |
| Migration | Form of relocation diffusion involving permanent move to a new location. |
| Migration transition | Change in the migration pattern in a society that results from industrialization, population growth, and other social and economic changes that also produce the demographic transition. |
| Migration stream | A constant flow of migrants from the same origin to the same destination. |
| Migration selectivity | Only people exhibiting certain characteristics in a population choosing to migrate. |
| Mobility | All types of movement from one location to another. |
| Net migration | The difference between the level of immigration and the level of emigration. |
| Quota | In reference to migration, a law that places maximum limits on the number of people who can immigrate to a country each year. |
| Push factors | Factors that induce people to leave old residences. |
| Pull factors | Factors that induce people to move to a new location. |
| Refugees | People who are forced to migrate from their home country and cannot return for fear of persecution because of their race, religion, nationality, membership in a social group, or political opinion. |
| Undocumented immigrants | People who enter a country without proper documents. |
| Space-time prism | The set of all points that can be reached by an individual given a maximum possible speed from a starting point in space-time and an ending point in space-time. |
| Urbanization | An increase in the percentage and in the number of people living in urban settlements. |
| Suburbanization | The process of population movement from within towns and cities to the rural-urban fringe. |
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