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someone

 
 
/ˈsʌmwʌn/ pronoun (also somebody)

Definition

used to refer to a person when you do not know who they are or when it is not important who they are: There's someone at the door. Will someone please answer the phone?
someone else a different person: Sorry, I thought you were talking to someone else.
(Definition of someone pronoun from the Cambridge Learner's Dictionary © Cambridge University Press)

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