birth rate

https://doi.org/10.1351/goldbook.14506
  1. (in demography) Number of live births in a defined administrative jurisdiction in a calendar year divided by a midyear population of the jurisdiction, with the customary multiplier of \(\pu{1000}\) to produce a whole number rather than a decimal or a fraction.
    Note: An alternative statistic is total fertility rate, the average number of children born to each woman over the course of her life. In general, the total fertility rate is a better indicator of fertility rates because, unlike the crude birth rate, it is not affected by the age distribution of the population.
  2. (in ecology) Number of births, \(B\), in a population of a defined size, \(N\), during a specified time interval \(\Delta t\). The rate is calculated from the formula \[B = \Delta N/\Delta t\] where \(\Delta N\) is the change in the number of births in a limited time period \(\Delta t\).

Source:
PAC, 2009, 81, 829. (Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)) on page 854 [Terms] [Paper]