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

Advertisement While the reversal in childhood mortality rates is alarming, Gates remains optimistic that in a few years, the trend will start moving in the right direction again, thanks to innovations such as new vaccines for RSV and treatments for malaria and tuberculosis that are on the horizon. —Alice Park, Time, 5 Dec. 2025

While maternal mortality rates for white, Hispanic and Asian women fell in 2023, according to the CDC report, the rate for Black women barely budged. —CBS News, 3 Dec. 2025

The maternal mortality rate for Black women in the United States is significantly higher than for other racial groups. —Zinhle Essamuah, NBC news, 25 Nov. 2025

Early tests suggest that saplings placed within TreeSoil experience a more stable microclimate, particularly in regions where intense heat or irregular rainfall lead to high mortality rates. —New Atlas, 20 Nov. 2025

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