one pronoun Definition in Essential English Dictionary
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Definition of "one" in Essential British English Dictionary

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one

pronoun
 
/wʌn/
A2 one person or thing in a group that has already been talked about: I’ve just made some biscuits. Do you want one? Chris is the one with glasses.
one by one separately, one after the other: They entered the room one by one.
one after another ( also one after the other) first one, then another, then another, and so on: One after another, they left the room. She ate the chocolates one after the other until the box was finished.
formal any person in general: One should respect one’s parents.
(Definition of one pronoun from the Cambridge Essential Dictionary © Cambridge University Press)
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