Origins
The word 'graffiti' entered English from Italian, where it is the plural of 'graffito' (a scratching, a scribble), derived from 'graffiare' (to scratch). The Italian verb traces back to Greek 'graphein' (γράφειν, to write, scratch), connecting modern spray-painted murals to the most ancient meaning of the Greek root: physically scratching marks into a surface.
The word was originally an archaeological term. When excavations at Pompeii and Herculaneum in the eighteenth and nineteenth centuries revealed thousands of inscriptions scratched into the plaster walls of ancient buildings, scholars needed a term for these informal, unofficial writings. Italian 'graffiti' was adopted for this purpose. The earliest English uses, from the 1850s, refer to these ancient inscriptions.
The Pompeian graffiti are extraordinary documents of everyday Roman life. They include political endorsements ('The fruit sellers with Helvius Vestalis urge the election of M. Holconius Priscus'), commercial advertisements, love declarations, obscenities, literary quotations, and casual observations. Some are surprisingly modern in tone: 'I am amazed, O wall, that you have not fallen in ruins from supporting the stupidities of so many scribblers.' The variety and informality of these inscriptions gave scholars a glimpse of colloquial Latin that formal literary texts never provided.
Modern Usage
The modern sense of 'graffiti' — unauthorized writing or art on public surfaces — developed gradually during the twentieth century. The practice of writing names, slogans, and images on walls and buildings is ancient and universal, but 'graffiti' as a specific cultural phenomenon is associated with the rise of urban graffiti culture in American cities during the 1960s and 1970s, particularly in New York City and Philadelphia. Young people began writing their names ('tags') on subway cars, buildings, and public infrastructure, and the practice evolved into increasingly elaborate styles of lettering and imagery.
The artistic status of graffiti remains debated. To municipal authorities and property owners, it is vandalism — defacement of public and private surfaces. To practitioners and many art critics, the best graffiti is a legitimate art form — one of the most vibrant visual movements of the late twentieth century. Artists like Jean-Michel Basquiat and Banksy have bridged the gap between street graffiti and the gallery world, though the tension between graffiti as art and graffiti as crime persists.
A grammatical note: in Italian, 'graffiti' is plural and 'graffito' is singular. In English, 'graffiti' is now commonly used as both singular and plural (treating it as an uncountable noun, like 'information'). The singular 'graffito' survives in English mainly in academic and archaeological contexts. This grammatical assimilation — treating an Italian plural as an English singular — mirrors the history of 'agenda' (Latin plural, now English singular) and 'data' (Latin plural, now often treated as singular in general usage).
Greek Origins
The deep etymological connection between 'graffiti' and 'graphic,' 'graph,' 'paragraph,' and the rest of the 'graphein' family is profoundly fitting. Greek 'graphein' began as 'to scratch marks into a surface' — precisely what graffiti, in its most literal sense, is. The word has come full circle: from scratching on clay and wax in ancient Greece, through the vast abstraction of writing, and back to scratching (and painting) on walls.