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English definition of “one”

one

number, determiner (ONLY)    /wʌn/
B2 used when saying there is no other person or thing: He's the one person you can rely on in an emergency . This may be your one and only (= only ever ) opportunity to meet her. My final guest on tonight's show needs no introduction . Please welcome the one and only Michael Jordan!Single, double and multiple
(Definition of one numberdeterminer (ONLY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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