Birth Rate: The number of live births per 1,000 people in a population in a year.
Replacement Level Fertility: The total fertility rate—the average number of children born per woman—at which a population exactly replaces itself from one generation to the next, without migration. This value is roughly 2.1 children per woman for most countries.
Demographic Transition Model: A model that describes population change over time. It involves transition from high birth and death rates to low birth and death rates as a country develops from pre-industrial to industrialized economic system.