| Term | Definition |
|---|
| age-sex pyramid | Graphic representation of a population showing the percentages of the total population by age and sex, normally in five-year groups. |
| crude birth rate (CBR) | The number of live births per year per thousand people in the population. |
| crude death rate (CDR) | The number of deaths per thousand. |
| demographic transition cycle | Has four stages in it. |
| demography | The study of patterns and rates of population change, including birth and death rates, migration trends, and evolving population patterns. |
| doubling time | The time required for a population to double in size. |
| exponential growth | Cumulative or compound growth over a given time period. |
| infant mortality | The number of children who die before their first birthday. |
| linear growth | A continuos addition of people at a consistant rate/time. |
| natural increase | The difference between the number of births and the number of deaths during a specific period. |
| population composition | A population's makeup in terms of age, sex, and other properties such as marital status and education. |
| population explosion | The rapid growth of the world's human population during the past century, attended by ever-shorter doubling times and accelerating rates of increase. |
| population structure | What the population is made up of. |
| stationary population level (SPL) | The level at which a national population ceases to grow. |
| total fertility rate (TFR) | The average number of children born to a woman during her lifetime, as expressed for a total population. |
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