Meaning of SOMEONE in English

SOMEONE

somebody [pronoun] - a single personThere's someone outside the house.Someone must have seen what happened.Surely someone knows where the documents are.Eventually someone in the audience spoke.USAGE: 'Anyone' is usually used instead of 'someone' in negative sentences and questions.(informal) We'll need a software engineer or someone (= a person with skill of or like the stated type) on the project team.

Cambridge English vocab.      Кембриджский английский словарь.