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English definition of “lifespan”

lifespan

noun [C] uk   /ˈlaɪf.spæn/ us  
C2 the length of time for which a person, animal, or thing exists: The average human lifespan in the developed countries has increased over the last hundred years. The project's lifespan is estimated at about five years.
(Definition of lifespan from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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