Emigration: The physical migration of a person or persons away from a given territory (perhaps a nation, a city, or some other community), and thus exiting the population of that territory
Immigration: The physical migration of a person or persons into a given territory, and thus joining the population of that territory (perhaps a nation, a city, or some other community)
Migration: The physical movement of a person or persons either into a given physical territory, or away from a physical territory
Net Migration: The mathematical difference between immigration and emigration in a given territory in a given period of time (usually a year). Net Migration can be expressed as: Immigration minus Emigration
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