| epidemiological transition theory | | The average number of children born per woman during |
| Anti-natalist policy | | When a country has the same number of births and deaths in a given year, its RNI is zero |
| Neo-Malthusians | | A person who leaves their country because of persecution based on race, ethnicity, religion, nationality, or political opinion |
| arithmetic density | | The average number of people per unit of land area (usually per square mile or kilometer) |
| megacity | | heavily populated areas that illustrate the unevenness in global population distribution; geographers have identified four population clusters on Earth: South Asia, East Asia, Southeast Asia, and Europe |
| Baby Boomers | | Designed to curtail population growth by reducing fertility rates |
| doubling time | | A nearby attractive locale where migrants may decide to settle instead of going to the intended destination farther away |
| chain migration | | The number of years it takes for a population to double in size |
| population clusters | | People born from 1946 to 1964 during the post-World War II uptick in birth rate |
| dependency ratio | | The process by which some people's migration to a new place leads their family members, friends, and others to move to the same place |
| Zero population growth (ZPG) | | People who today subscribe to the Malthusian view of population |
| forced migration | | The average number of people per unit area (a square mile or kilometer) of arable land |
| transhumance | | A very useful graphic device for comparing age and sex structure |
| guest worker | | A term derived from the name Thomas Robert Malthus, an English economist and cleric, to mean either "of or relating to Malthus's theory" or "a follower of Malthus" |
| total fertility rate | | Seeks to explain how changes in health services and living standards affect patterns of disease |
| intervening opportunity | | A city with more than 10 million residents |
| population pyramid | | a person with temporary permission to work in another country |
| Malthusian | | A phenomenon where herders and their livestock move seasonally between their summer and winter pastures |
| physiological density | | The number of dependents in a population that each 100 working-age people (ages 15 to 64 years) must support |
| refugees | | Migration caused by forces out of one's control, such as disasters, social conflicts, or developmental projects |
