1. writing or drawings scribbled, scratched, or sprayed illicitly on a wall or other surface in a public place
Usage: usually plural in form but can be treated as singular or plural

Examples

• The subway walls were covered with colorful graffiti.
• City workers spent the morning removing graffiti from the bridge.
• Some people consider graffiti to be vandalism, while others see it as art.
• The artist was arrested for spray-painting graffiti on public buildings.
• Ancient graffiti can be found on the walls of Pompeii.
• The school installed security cameras to prevent graffiti on campus.
• Street artists often use graffiti to express political messages.