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English definition of “one”

one

determiner
 
/wʌn/
A2 one person or thing in a group: One of their daughters has just got married.
A2 at a particular time in the past: I first met him one day in the park.
one or two B1 a few: I’d like to make one or two suggestions.
used to refer to a time in the future that is not yet decided: We should go out one evening.
used when saying there is no other person or thing: He’s the one person who never forgets my birthday.
a single thing: I think we should paint the bedroom all one colour.
(Definition of one determiner from the Cambridge Essential Dictionary © Cambridge University Press)
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