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Definition of lifetime noun from the Oxford Advanced American Dictionary

 

lifetime

 noun
noun
NAmE//ˈlaɪftaɪm//
 
 
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  • the length of time that someone lives or that something lasts His diary was not published during his lifetime. a lifetime of experience in the lifetime of the present government He had spent a lifetime trying to please his father.
    • Idioms
    the chance, etc. of a lifetime
     
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    a wonderful opportunity, etc. that you are not likely to get again the trip of a lifetime When she was offered the job she knew it was the chance of a lifetime.
    once in a lifetime
     
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    used to describe something special that is not likely to happen to you again An opportunity like this comes once in a lifetime. a once-in-a-lifetime experience
    See lifetime in the Oxford Advanced Learner's Dictionary
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