Definitions for "Rate of natural increase"
With respect to a population of a nation or geographical area, birth rate minus death rate. If there were no migration, this would equal the rate of population increase (decrease).
The birth rate minus the death rate, which measures the annual rate of population growth excluding migration. Although Germany's rate of natural increase was -0.1% per year in 1992, the country's population continued to grow because of a large number of immigrants, 600,000 that year.
The difference between the crude birth rate and the crude death rate.