Longman Dictionary of Contemporary English homepage

one

4 adjective
     
one4 [only before noun]
1 only:
Her one concern was to get to the door without being seen.
Claire is the one person I can trust.
2

one and only

a) used to emphasize that someone is very famous:
the one and only Frank Sinatra
b) used to emphasize that something is the only one of its kind:
I even tried my one and only French joke on them.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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