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English definition of “one”

one

number, determiner (EMPHASIS)    /wʌn/ mainly US
used to emphasize an adjective : His mother is one (= a very) generous woman. That's one (= a very) big ice-cream you've got there. It was one hell of a (= a very great ) shock to find out I'd lost my job .Very and extremeComplete and wholeIntensifying expressions
(Definition of one numberdeterminer (EMPHASIS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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