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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 Pompeii. [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. [PJC]