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one

number, determiner (EMPHASIS)
 
 
/wʌn/ mainly US

Definition

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)

“one” in other dictionaries

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