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English definition of “one”

one

pronoun     /wʌn/
PARTICULAR PERSON/THING A2 used to refer to a particular person or thing in a group that has already been talked about: I've just made some biscuits , do you want one? Throw those gloves away and get some new ones . Chris is the one with glasses .Single, double and multipleParticular and individualPersonal pronouns
GENERAL formal any person in general : One ought to respect one's parents .Personal pronouns
one at a time B2 separately : Eat them one at a time .Order and sequenceSimultaneous and consecutive
one by one B2 separately , with one thing happening after another: One by one the old buildings have been demolished .Order and sequenceSimultaneous and consecutive
one another B1 each other: How can they reach an agreement if they won't talk to one another?Reciprocating
(all) in one combined into a single thing: It's a vacation and art course all in one.Single, double and multiple
(Definition of one pronoun from the Cambridge Learner's Dictionary © Cambridge University Press)

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