In English, a lot of words about writing (like "graph," "autograph," "grammar," and "pictogram") trace back to the Greek word graphein, which means "to write." Here's another word that comes from graphein: "graffiti."
Graffiti is stuff that's written or drawn without permission on public property. In other words, it's drawings or scribbles on fences, walls, trains, subways, bathroom stalls, and other public places.
For example, in the TV clip below, Will is drawing graffiti on a wall with spray paint, and a policeman is stopping him. (Will then pretends he's just spraying himself and not the wall!)
Street art is legal. Graffiti is illegal. You're not allowed to draw graffiti, but many graffiti artists do it anyway.
Lastly, did you notice that the word "graffiti" is uncountable? We say things like "Look at all that graffiti" and "There's so much graffiti downtown." But we don't say, "I saw three graffitis on the subway." In fact, the word that means "one piece of graffiti" is "graffito." "Look at that graffito." "Isn't this graffito lovely?" Not many English speakers know that word. But now you do!
Make a flash card:
You can write your own definition and choose your own picture, or copy mine.
paintings or other markings in public that someone secretly drew
Write your own sentence!
You can use either of the two ideas I'll suggest, or you can invent your own. Include as much detail as you can!