lifetime

Etymology

From Middle English lyftyme, equivalent to life + time. Compare Saterland Frisian Lieuwendstied, Dutch leeftijd and levenstijd, German Low German Levenstied, German Lebenszeit, Danish livstid, Swedish livstid, Icelandic líftími.

noun

  1. The duration of the life of someone or something.
    a project that will take many human lifetimes to complete
    the operational lifetime of an aircraft component
    comes with a lifetime warranty
  2. (informal, hyperbolic) A long period of time.
    I've been waiting a lifetime for a train.

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