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English definition of “one”

one

determiner
 
 
/wʌn/
PARTICULAR PERSON/THING A2 used to refer to a particular person or thing in a group: One drawback is the cost of housing in the area. One of our daughters has just got married.Single, double and multiple
FUTURE TIME B2 used to refer to a time in the future that is not yet decided: We must have a drink together one evening.Describing when something happened or will happen
TIME IN PAST B2 at a particular time in the past: I first met him one day in the park.Describing when something happened or will happen
ONLY B2 only: He's the one person you can rely on in this place.Single, double and multipleSingle, double and multiple
WITH ADJECTIVE mainly US used to emphasize an adjective: That's one big ice cream you've got there!Intensifying expressions
one or two B1 a few: I'd like to make one or two suggestions. → See also put sth to one side, be one step ahead (of sb)Small in number and quantity
(Definition of one determiner from the Cambridge Learners Dictionary © Cambridge University Press)
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