graffiti: definition

Dictionary.com: Graffiti (singular: graffito; the plural is used as a mass noun) is the name for images or lettering scratched, scrawled, painted or marked in any manner on property. Graffiti is sometimes regarded as a form of art and other times regarded as unsightly damage or unwanted.

Moreh-Art: Graffiti is the name for images or lettering scratched, scrawled, painted or marked in any manner on virtually any surface. Graffiti is any type of markings that may appear in the forms of simple written words to elaborate wall paintings.

Wikipedia: Graffiti is any type of public markings that may appear in the forms of simple written words to elaborate wall paintings.

Persue: Any type of writing on the wall

AWE Group Definition: Graffiti is an individual's unique expression of his/herself through making one's personal mark on any property (physical or digital), which can exist as images, letters, or other forms of symbols.