Charity auction site charitybuzz to host a star-studded line-up of once-in-a-lifetime experiences.
A Star-Studded Auction|The Daily Beast|May 3, 2011|DAILY BEAST
once in a lifetime
SEE SYNONYMS FOR once in a lifetime ON THESAURUS.COM
Extremely rare, especially as an opportunity. For example, An offer like that will come just once in a lifetime. This phrase, often used hyperbolically, was first recorded in 1854. Also see of one's life.
Words nearby once in a lifetime
on-camera, once, once and for all, Once bitten, twice shy, once in a blue moon, once in a lifetime, once in a while, Once more unto the breach, dear friends, once-over, once-over-lightly, oncer