The definition is: "The rate of increased size per unit time".
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math
the birth rate is the rate of birth in a population, the death rate is the number of deaths in a population and the growth rate is the growing numbers of the population.
In geometric growth the ratios of successive terms is the same whereas in arithmetic growth the differences are the same.
The Variable Rate is the rate at which a number changes
The definition of natality is birth rate. It is a French word.