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once-in-a-lifetime

adjective [before noun]
 
 
/ˌwʌn.sɪnəˈlaɪf.taim/

Definition

describes an experience or opportunity that is very special because it is the only time you will be able to have it: A tour of Australia is a once-in-a-lifetime experience.Unique and unusualGood, better and best in terms of qualityRarely and infrequently
(Definition of once-in-a-lifetime adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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