What is another word for once in a lifetime?
Pronunciation: [wˈɒns ɪn ɐ lˈa͡ɪfta͡ɪm] (IPA) 
Once in a lifetime opportunities are rare and special. Fortunately, there are several synonyms for this phrase that can help better illustrate the uniqueness of such experiences. Such synonyms include, "a once-off chance", "a rare occasion", "a singular moment", "an extraordinary event", "a special occasion", and "a unique occurrence". Each synonym has its own nuance, but all highlight the infrequency of the opportunity. These terms emphasize the importance of taking advantage of momentous experiences when presented, as they may never come again.
