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English definition of “someone”

someone

pronoun uk   /ˈsʌm.wʌn/ (also somebody) us  
A2 used to refer to a single person when you do not know who they are or when it is not important who they are: There's someone outside the house. Someone must have seen what happened. Eventually someone in the audience spoke. You'll have to ask someone else. We'll need a software engineer or someone (= a person with skill of or like the stated type) on the project team. Note: Someone is not usually used in negatives and questions.
(Definition of someone from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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