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
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Despite the staggering amount spent in the healthcare sector, Americans have the lowest life expectancy, 79, and the second-highest avoidable mortality rate among comparable nations. Joshua P. Cohen, Forbes.com, 2 July 2026 But overdoses are the biggest killer of younger people, and the change will likely have boosted US life expectancy — determined by death rates at all age groups — to another record, CNN noted. Tom Chivers, semafor.com, 2 July 2026 The pension system reform would include gradually raising the retirement age, currently between 65 and 67 years depending on the number of years worked, in line with life expectancy. ABC News, 2 July 2026 For those sent to the front, the average life expectancy stands at around two or three weeks, according to one Russian military blogger who follows the fighting closely. Simon Shuster, The Atlantic, 1 July 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 5 Jul. 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

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