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English definition of “one”

one

number, determiner (PARTICULAR OCCASION)    /wʌn/
B2 used to refer to a particular occasion while avoiding stating the exact moment: One night we stayed up talking till dawn. He was attacked as he was walking home from work late one afternoon. One moment he says he loves me, the next moment he's asking for a divorce. She never seems to know what she's doing from one minute to the next.Points in time
(Definition of one numberdeterminer (PARTICULAR OCCASION) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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