life expectancy

noun

: the average lifespan of an individual

Examples of life expectancy in a Sentence

improvements in diet that have resulted in greater life expectancy for many people calculating the life expectancies of different social groups
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Americans, based on CDC life expectancy data, are alive for around 4,000 Saturdays. Joe Kinsey Outkick, FOXNews.com, 12 June 2026 In 1800, just as the first true vaccine—against smallpox—came into use, life expectancy at birth hovered around thirty years worldwide. Literary Hub, 11 June 2026 The average life expectancy is about 14 to 16 months. Wendy Grossman Kantor, PEOPLE, 11 June 2026 Most alarming is the steady decline in child health and life expectancy. Nicole F. Roberts, Forbes.com, 11 June 2026 See All Example Sentences for life expectancy

Word History

First Known Use

1848, in the meaning defined above

Time Traveler
The first known use of life expectancy was in 1848

Browse Nearby Words

Cite this Entry

“Life expectancy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/life%20expectancy. Accessed 17 Jun. 2026.

Kids Definition

life expectancy

noun
: the number of years that an individual or group of a certain age can expect to live on the average based on experience in the past for individuals or groups of the same kind

Medical Definition

life expectancy

noun
: an expected number of years of life based on statistical probability

Legal Definition

life expectancy

noun
: the average life span of an individual

More from Merriam-Webster on life expectancy

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster