The Collaborative International Dictionary of English v.0.48:

Celebrity \Ce*leb"ri*ty\, n.; pl. Celebrities. [L. celebritas:
   cf. F. c['e]l['e]brit['e].]
   1. Celebration; solemnization. [Obs.]
      [1913 Webster]

            The celebrity of the marriage.        --Bacon.
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   2. The state or condition of being celebrated; fame; renown;
      as, the celebrity of Washington.
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            An event of great celebrity in the history of
            astronomy.                            --Whewell.
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   3. A person of distinction or renown; -- usually in the
      plural; as, he is one of the celebrities of the place.
      [1913 Webster]

WordNet (r) 3.0 (2006):

celebrity
    n 1: a widely known person; "he was a baseball celebrity" [syn:
         celebrity, famous person]
    2: the state or quality of being widely honored and acclaimed
       [syn: fame, celebrity, renown] [ant: infamy,
       opprobrium]