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单词 life expectancy
释义

WordReference Random House Unabridged Dictionary of American English © 2024
life′ expect′ancy, 
  1. Developmental Biologythe probable number of years remaining in the life of an individual or class of persons determined statistically, affected by such factors as heredity, physical condition, nutrition, and occupation. Also called expectancy of life. 
  • 1930–35

Collins Concise English Dictionary © HarperCollins Publishers::
life expectancy n
  1. the statistically determined average number of years of life remaining after a specified age for a given group of individuals
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