'Lifetime' definitions:

Definition of 'lifetime'

(from WordNet)
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" [syn: life, lifetime, life- time, lifespan]

Definition of 'Lifetime'

From: GCIDE
  • Lifetime \Life"time`\ (l[imac]f"t[imac]m`), n. The time that life continues. [1913 Webster]

Synonyms of 'lifetime'

From: Moby Thesaurus