The Collaborative International Dictionary of English v.0.48:

Person \Per"son\ (p[~e]r"s'n; 277), n. [OE. persone, persoun,
   person, parson, OF. persone, F. personne, L. persona a mask
   (used by actors), a personage, part, a person, fr. personare
   to sound through; per + sonare to sound. See Per-, and cf.
   Parson.]
   1. A character or part, as in a play; a specific kind or
      manifestation of individual character, whether in real
      life, or in literary or dramatic representation; an
      assumed character. [Archaic]
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            His first appearance upon the stage in his new
            person of a sycophant or juggler.     --Bacon.
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            No man can long put on a person and act a part.
                                                  --Jer. Taylor.
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            To bear rule, which was thy part
            And person, hadst thou known thyself aright.
                                                  --Milton.
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            How different is the same man from himself, as he
            sustains the person of a magistrate and that of a
            friend!                               --South.
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   2. The bodily form of a human being; body; outward
      appearance; as, of comely person.
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            A fair persone, and strong, and young of age.
                                                  --Chaucer.
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            If it assume my noble father's person. --Shak.
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            Love, sweetness, goodness, in her person shined.
                                                  --Milton.
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   3. A living, self-conscious being, as distinct from an animal
      or a thing; a moral agent; a human being; a man, woman, or
      child.
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            Consider what person stands for; which, I think, is
            a thinking, intelligent being, that has reason and
            reflection.                           --Locke.
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   4. A human being spoken of indefinitely; one; a man; as, any
      person present.
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   5. A parson; the parish priest. [Obs.] --Chaucer.
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   6. (Theol.) Among Trinitarians, one of the three subdivisions
      of the Godhead (the Father, the Son, and the Holy Ghost);
      an hypostasis. "Three persons and one God." --Bk. of Com.
      Prayer.
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   7. (Gram.) One of three relations or conditions (that of
      speaking, that of being spoken to, and that of being
      spoken of) pertaining to a noun or a pronoun, and thence
      also to the verb of which it may be the subject.
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   Note: A noun or pronoun, when representing the speaker, is
         said to be in the first person; when representing what
         is spoken to, in the second person; when representing
         what is spoken of, in the third person.
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   8. (Biol.) A shoot or bud of a plant; a polyp or zooid of the
      compound Hydrozoa, Anthozoa, etc.; also, an individual, in
      the narrowest sense, among the higher animals. --Haeckel.
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            True corms, composed of united person[ae] . . .
            usually arise by gemmation, . . . yet in sponges and
            corals occasionally by fusion of several originally
            distinct persons.                     --Encyc. Brit.
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   Artificial person, or Fictitious person (Law), a
      corporation or body politic; -- this term is used in
      contrast with natural person, a real human being. See
      also legal person. --Blackstone.

   Legal person (Law), an individual or group that is allowed
      by law to take legal action, as plaintiff or defendent. It
      may include natural persons as well as fictitious persons
      (such as corporations).

   Natural person (Law), a man, woman, or child, in
      distinction from a corporation.

   In person, by one's self; with bodily presence, rather than
      by remote communication; not by representative. "The king
      himself in person is set forth." --Shak.

   In the person of, in the place of; acting for. --Shak.
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WordNet (r) 3.0 (2006):

in person
    adv 1: in the flesh; without involving anyone else; "I went
           there personally"; "he appeared in person" [syn:
           personally, in person]