| Term | Definition |
| economic opportunity, cultural freedom, environmental comfort | What are the three objectives as to why people migrate? |
| emigration | migration FROM a location |
| immigration | migration TO a location |
| migration | permanent move to a new location and is classified as a specific type of relocation diffusion |
| mobility | general term covering all types of movements from one place to another |
| circulation | specific type of mobility and is the repetition of a movement on a regular basis |
| push factor | includes anything that would cause someone to want to move FROM somewhere |
| pull factor | induces people to move TO someplace because that place has something enticing to offer |
| voluntary migration | someone chooses to leave a place, either as a result of push/pull factors |
| chain migration | people follow others in succession from one place to another |
| forced (involuntary) migration | someone is removed from his/her home and must leave the area without any choice |
| intervening obstacles | any forces/factors that may limit human migration |
| refugees | people who leave their home because they are forced out, but not because they are being officially relocated or enslaved |
| net migration | difference between the number of immigrants and the number of emigrants |
| brain drain | large-scale emigration by talented people |
| counterurbanization | net migration from urban to rural areas |
| floodplain | [of a river] the area subject to flooding during a specific number of years, based on historical trends |
| guest workers | citizens of poor countries who obtain jobs in Western Europe and the Middle East |
| internal migration | permanent movement within the same country |
| international migration | permanent movement from one country to another |
| interregional migration | movement from one region of a country to another |
| intraregional migration | movement within one region |
| migration transition | [Wilbur Zelinsky] consists of changes in a society comparable to those in the demographic transition |
| quotas | maximum limits on the number of people who could immigrate to the United States from each country during a 1-year period |
| undocumented immigrants | unauthorized immigrants; entering without proper documents |