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life·time / ˈlīfˌtīm/ • n. the duration of a person's life: a reward for a lifetime's work. ∎  the duration of a thing's existence or usefulness: a plan to extend the lifetime of satellites. ∎ inf. used to express the view that a period is very long: five weeks was a lifetime, and anything could have happened.PHRASES: of a lifetime (of a chance or experience) such as does not occur more than once in a person's life: because of Frankie she had rejected the opportunity of a lifetime.

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