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Definition of Birth rate
1. Noun. The ratio of live births in an area to the population of that area; expressed per 1000 population per year.
Medical Definition of Birth rate
1. The birth rate is usually given as the number of live births divided by the average population (or the population at midyear). This is termed the crude birth rate. In 1995, for example, the crude birth rate per 1,000 population was 14 in the United States, 16.9 in Australia, etc. (12 Dec 1998)