A measure of an area's fertility. It is expressed as the number of live births per 1,000 people in 1 year.
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Death rate
The number of deaths per 1,000 people in 1 year.
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Life expectancy
The average number of years from birth that a person can expect to live.
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Longevity
The increase in life expectancy over a period of time. It is a direct result of improved medical provision and increased levels of economic development. People live longer and this creates an older population.
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Natural change
The change in size of a population caused by the interrelationship between birth and death rates. If birth rate exceeds death rate, a population will increase. If death rate exceeds birth rate, a population will decline.
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Fertility
The number of live births per 1,000 women aged 15-49 in 1 year. It is also defined as the average number of children each women in a population will bear. If this number is 2.1 or higher, a population will replace itself.
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Infant mortality rate
The number of deaths of children under the age of 1 year expressed per 1,000 live births per year.
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Population structure
The proportion of males and females in an area, usually in the form of age distribution.
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Forced migration
The migrant has to migrate because of circumstances.
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International migration
The UN defines international migration as the movement of people across national frontiers, for a minimum of 1 year.
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Migration
A permanent or semi permanent change of residence of an individual or group of people.
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Net migration
The difference between the numbers of in-migrants and out-migrants in an area. When in-migrants exceeds out-migrants, there is net migrational gain. When out-migrants exceeds in-migrants, there is net migrational loss.
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