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Noun: lifetime  'lIf,tIm
  1. The period during which something is functional (as between birth and death)
    "the battery had a short lifetime";
    - life, life-time, lifespan
  2. [] A prolonged period of time
    "we've known each other for lifetimes";
    - long time, age, years, donkey's years [Brit, informal], yonks [Brit, informal]

Derived forms: life-times, lifetimes

Type of: period, period of time, time period

Encyclopedia: Lifetime