Birth Rate: The number of births per 1000 people in the population per year in a country.

Death Rate: The number of deaths per 1000 people in the population per year in a country.

Emigration: The migration of people out of a country.

Immigration: The migration of people into a country.

LEDC: Less Economically Developed Country.

MEDC: More Economically Developed Country.

Migration: The permanent or semi-permanent movement of people to live and work in another area or country.

Natural Increase: The relationship between the birth rate and the death rate of a country or area.

Population Growth: The difference between (BR + Immigration) and (DR+ Emigration).