the proportion of births to the total population in a place in a given time, usually expressed as a quantity per 1000 of population.

1855–60; birth + rate1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

birthrate or birth rate
The ratio of total live births to total population in a specified community or area over a specified period of time, often expressed as the number of live births per 1,000 of the population per year.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Right whales are hampered by a relatively low birthrate, and researchers think one cause may be ocean pollution.
It should be acknowledged that inward migration from neighboring countries and a high birthrate are factors.
While some officials say such efforts have slowed the declining birthrate, statistics suggest otherwise.
Around the world, there is a tendency for people who are better off to have a lower birthrate.
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