From The Collaborative International Dictionary of English v.0.48:

Graffiti \Graf*fi"ti\, n. pl. [It., pl. of graffito scratched]
   1. Inscriptions, figure drawings, etc., found on the walls of
      ancient sepulchers or ruins, as in the Catacombs, or at
      [1913 Webster]

   2. any writings or drawings on a surface in a public place,
      placed there without authorization of the owner of the
      object on which it is written. Such graffiti are usually
      unwelcome, and are considered as form of vandalism.
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