Relier Pairs Measuring populationsVersion en ligne Now you have to relate the terms with its definition. par Laura Jiménez Ruiz 1 Natural increase 2 Immigrant 3 Emigrant 4 Absolute population 5 Actual increase 6 Population density A person who moves into an area. Includes the natural increase, the immigrants arriving and emigrants leaving. The average number of people who live in each square kilometre of land. A person who moves away from an area. The total number of people living in an area. The difference between the number of births and the number of deaths.