Fatality Rate

Fatality Rate, or Case Fatality Rate, is the ratio of deaths within a designated population, over a certain period of time. An example of a fatality rate would be 9/10,000 per year. This means that within a given year, and out of 10,000 people formally diagnosed with a disease, 9 of them died.
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Noun
1. the ratio of deaths in an area to the population of that area; expressed per 1000 per year
(synonym) deathrate, death rate, morbidity, mortality, mortality rate
(hypernym) rate
(hyponym) infant deathrate, infant mortality, infant mortality rate

The fatality rate is the number of fatalities per 100 million vehicle miles of travel. (FHWA5)

The average number of fatalities which occurred per accident or per one hundred accidents. (FHWA2)