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