mortality rate

noun

plural mortality rates

: the ratio between deaths and individuals in a specified population and during a particular time period : the incidence of deaths in a given population during a defined time period (such as one year) that is typically expressed per 1000 or 100,000 individuals : death rate

an annual mortality rate of 15 deaths per 1000 people

Note: A crude mortality rate does not distinguish between specific causes of death or groups of individuals and measures the incidence of all deaths in a population during a given time period. More specific mortality rates are based on narrower categories of individuals or causes of death.

an infant mortality rate of 9 deaths per 1000 live births

mortality rates of lung cancer patients

infectious disease mortality rates

Examples of mortality rate in a Sentence

Recent Examples on the Web

By communicating with incarcerated activists Robert Earl Council and Melvin Ray, the film exposes systemic issues, including brutal conditions and high mortality rates, while advocating for transparency and justice in a system that often operates in secrecy. —Brande Victorian, HollywoodReporter, 7 Apr. 2026

With maternal mortality rate on the rise, the goal is to make sure Black mothers and their babies are safe and healthy. —Todd Feurer, CBS News, 7 Apr. 2026

Low fertility rates, coupled with longer life expectancy due to lower mortality rates, also feed into the phenomenon of population aging, where the proportion of older people in a population increases relative to the working-age population. —Encyclopedia Britannica, 6 Apr. 2026

In 2024, experts from the Gulf Coast Canine Project voiced concerns to the state transportation agency about ghost wolf mortality rates along FM 3005, the main road running along the coast, especially as development grows on Galveston Island. —Ashley Soebroto, Houston Chronicle, 4 Apr. 2026

Word History

First Known Use

1855, in the meaning defined above

Rhymes for mortality rate

• borosilicate
• decontaminate
• deoxycholate
• deteriorate
• differentiate
• diisocyanate
• dinoflagellate
• excommunicate
• incapacitate
• insubordinate
• intercorporate
• interpenetrate

Medical Definition

mortality rate

noun

: the ratio between deaths and individuals in a specified population and during a particular time period : the incidence of deaths in a given population during a defined time period (such as one year) that is typically expressed per 1000 or 100,000 individuals : death rate

an annual mortality rate of 15 deaths per 1000 people

Note: A crude mortality rate does not distinguish between specific causes of death or groups of individuals and measures the incidence of all deaths in a population during a given time period. More specific mortality rates are based on narrower categories of individuals or causes of death.

mortality rates of liver cancer patients

an infant mortality rate of 9 deaths per 1000 live births