English dictionary lifespan meaning and definition Definition and meaning of lifespan at MeaningMonkey.org. lifespan meaning and definition in the English Dictionary. LIFESPAN nounDefinition of lifespan (noun)the period during which something is functional (as between birth and death)"the battery had a short life"; "he lived a long and happy life"synonyms: life, lifetime, life-time Source: Princeton University Wordnet
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