Meaning of “one and only” in the English Dictionary

american-english dictionary

"one and only" in American English

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one and only

only:

This may be your one and only opportunity to meet her.

the one and only

the only person or thing of this type:

And now I'd like to introduce, the one and only Stevie Wonder!

(Definition of “one and only” from the Cambridge Academic Content Dictionary © Cambridge University Press)