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English definition of “someone”

someone

pronoun     /ˈsʌm.wʌn/ (also somebody)
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.Someone, anyone, no one or everyone Grammar:Someone, somebody, something, somewhereSomeone, somebody, something, somewhere are indefinite pronouns. They function in a similar way to some. We use them in affirmative clauses and in questions expecting a particular answer. We can use them to refer to both general and specific people or things. We use them with a singular verb:See more
(Definition of someone pronoun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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