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English definition of “one”

one

pronoun (COMPARISON)    /wʌn/
used to talk about one person or thing compared with other similar or related people or things: They look so similar it's often difficult to distinguish one from the other. You may have one or the other, but not both. Crime and freedom are inseparable. You can't have one without the other.Comparing and contrasting
(Definition of one pronoun (COMPARISON) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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