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

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once-in-a-lifetime

adjective [before noun] uk   /ˌwʌn.sɪnəˈlaɪf.taim/ us  
A once-in-a-lifetime experience or opportunity is very special because you will probably only have it once: A tour of Australia is a once-in-a-lifetime experience.
Translations of “once-in-a-lifetime”
in Chinese (Traditional) 一生中難得一次的, 千載難逢的, 難能可貴的…
in Chinese (Simplified) 一生中难得一次的, 千载难逢的, 难能可贵的…
(Definition of once-in-a-lifetime from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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