|Also called (esp US): mortality rate the ratio of deaths in a specified area, group, etc, to the population of that area, group, etc|
death rate n.
The ratio of total deaths to total population in a specified community or area over a specified period of time; often expressed as the number of deaths per 1,000 of the population per year. Also called fatality rate, mortality rate.
in demographic usage, the frequency of death in a population
Learn more about death rate with a free trial on Britannica.com.