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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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