Definition of life expectancy noun from the Oxford Advanced American Dictionary

 

life expectancy

 noun
noun
 
(also expectation of life)[uncountable, countable]
 
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the number of years that a person is likely to live; the length of time that something is likely to exist or continue for Life expectancy for both men and women has improved greatly in the past 20 years. Women have a longer life expectancy than men. The life expectancy of a large bus is about 15 years.
See the Oxford Advanced Learner's Dictionary entry: life expectancy