mortality rate

American  

[mawr-tal-i-tee reyt] / mɔrˈtæl ɪ ti ˌreɪt /

noun

mortality rates plural

1. the relative frequency of deaths in a specific population during a specified time, often cited as the percentage of human deaths during a public health crisis, or of wildlife deaths due to environmental perils.

   Patients over the age of 80 had the highest mortality rate during the last flu season.

   The mortality rate of the bald eagle falls to about 25 percent after the first year of life.

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mortality rate British  

noun

1. another term for death rate

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Other Word Forms

Noun Inflected Forms

• mortality rates
  plural

Etymology

Origin of mortality rate

First recorded in 1860–65

Example Sentences

See Examples For:

mortality rate

The practice fell out of favor by the early 20th century, in part because of the reduced infant mortality rate.

From Slate ● Jul. 19, 2026

“No humans were harmed during the making of this program” could be the teaser to “World’s Biggest Sharks,” though leading with a low mortality rate wouldn’t be ideal for the “Sharkfest” brand.

From The Wall Street Journal ● Jul. 2, 2026

The incubation period is between two and 21 days, and the mortality rate in past Bundibugyo outbreaks was between 30% and 50%.

From MarketWatch ● May 17, 2026

It’s easy to get distracted by hantavirus’s mortality rate, which can reach up to 50%.

From Barron's ● May 8, 2026

Within days, the mortality rate from bacterial infections decreases to levels never before achieved.

From "We Are the Ants" by Shaun David Hutchinson