Definition of someone pronoun from the Oxford Advanced American Dictionary

     

    someone

     pronoun
    pronoun
    NAmE//ˈsʌmwʌn//
     
    (also somebody)
     
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  1. 1 a person who is not known or mentioned by name There's someone at the door. Someone's left their bag behind. It's time for someone new (= a new person) to take over. It couldn't have been me—it must have been someone else (= a different person). Should we call a doctor or someone? The difference between someone and anyone is the same as the difference between some and any. Look at the notes there.
  2. 2 an important person He was a small-time lawyer eager to be someone. compare nobody
See the Oxford Advanced Learner's Dictionary entry: someone