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