Definition of graffiti noun from the Oxford Advanced American Dictionary

 

graffiti

 noun
noun
NAmE//ɡrəˈfit̮i//
 
[uncountable, plural]
 
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drawings or writing done on a wall, etc. in a public place without permission The subway was covered in graffiti. Someone had scrawled graffiti all over the school walls.
See the Oxford Advanced Learner's Dictionary entry: graffiti