The Collaborative International Dictionary of English v.0.48:

Somebody \Some"bod*y\ (s[u^]m"b[o^]d*[y^]), n.
   1. A person unknown or uncertain; a person indeterminate;
      some person.
      [1913 Webster]

            Jesus said, Somebody hath touched me. --Luke viii.
                                                  46.
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            We must draw in somebody that may stand
            'Twixt us and danger.                 --Denham.
      [1913 Webster]

   2. A person of consideration or importance.
      [1913 Webster]

            Before these days rose up Theudas, boasting himself
            to be somebody.                       --Acts v. 36.
      [1913 Webster]

WordNet (r) 3.0 (2006):

somebody
    n 1: a human being; "there was too much for one person to do"
         [syn: person, individual, someone, somebody,
         mortal, soul]