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English definition of “once-in-a-lifetime”

once-in-a-lifetime

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