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Pronunciation varies by accent · adjective
Likely to happen only once in one's lifetime; extremely rare..
a once-in-a-lifetime opportunity to travel the world
With Trump in office, they see what one Gulf official called a “once-in-a-lifetime opportunity” to achieve his country’s objectives.
Use once-in-a-lifetime when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Once-in-a-lifetime means Likely to happen only once in one's lifetime; extremely rare..
Common synonyms include of a lifetime.
The opposite depends on the specific sense.
a once-in-a-lifetime opportunity to travel the world
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