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

Research shows, however, that access to modern contraceptives, and the ability to prevent or space out pregnancies, improves maternal mortality rates, family incomes and babies’ health. —Lauren Kent, CNN Money, 24 Apr. 2026

Hispanic adults saw the steepest rise in rectal cancer deaths, according to the study, and had the fastest-growing mortality rates of any demographic group. —Erika Edwards, NBC news, 23 Apr. 2026

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, 23 Apr. 2026

Researchers found morning naps as well as longer and more frequent naps were associated with higher all-cause mortality rates in adults with an average age of 81. —Nicole Fallert, USA Today, 23 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