| A | B |
|---|
| Activity space | The area in which an individual can travel to within the span of one day; area of personal sustained human activity. |
| Brain drain | Phenomena of the emigration of the most intellectually gifted and vocationally qualified citizens of LDCs to MDCs. |
| Counter-urbanization | Migration from cities out into rural areas. |
| Distance Decay | Contact between areas and a persons ability to travel there decay as distance increases. |
| Emigration | Permanent migration out of a native country. |
| Floodplain | a nearly flat plain along the course of a stream or river that is naturally subject to flooding |
| Guest workers | Individuals on temporary visas subject to withdrawal upon termination of temporary employment. |
| Immigration | Permanent migration into a non native country. |
| Internal migration | Permanent movement within a country. |
| International migration | Permanent migration from one country to another country. |
| Interregional migration | Internal migration from one region to another region. |
| Intervening obstacle | A physical or cultural barrier to the movement of individuals between places EG; a mountain or an immigration policy. |
| Intraregional migration | Permanent migration within the same region. |
| Migration | The long term movement of a person from one political jurisdiction to another. |
| Migration (Chain / Step) | The phenomena of people relocating to areas where their family, friends, or other of similar ethnicity have already relocated. |
| Migration (forced) | When individuals are removed to another place without any choice. |
| Migration (voluntary) | When individuals elect to move to another place. |
| Migration (Circulation) | Residents of LDCs who travel to MDCs for training and temporary economic opportunities who return to their native countries. |
| Mobility | The means and abilities of individuals and groups to relocate. |
| Net migration | the balance between in-migration to an area and out-migration from the area over a specified period of time (e.g., 10 years) on the area's population. |
| Periodic Movement | Recurring migration that is dependent on a cyclical factor. |
| Pull factor | Social, environmental, or economic factors which cause individuals to migrate to a new place. |
| Push factor | Social, environmental, or economic factors which cause individuals to migrate from and old place. |
| Quotas | Numerical limits on immigration or emigration. |
| Refugees | a person who flees for refuge or safety, esp. to a foreign country, as in time of political upheaval, war, etc. |
| Space-time prism | The distance between places in terms of time one travels. |
| Transhumance | An occupation requires following the migration of livestock also known as pastoralism or nomadism. |
| Undocumented immigrants / Illegal Aliens | Migrants who enter a country by extra legal means and generally earn money through employment which is not taxed. |
