around
In a circle or surrounding something on all sides.
Around is a word that describes position or movement in a circular or surrounding way. When you walk around a building, you follow its outer edge. When friends gather around a campfire, they form a circle with the fire at the center.
The word also means approximately or roughly. If someone says “around fifty people” attended the concert, they mean close to fifty, maybe forty-eight or fifty-three. When you tell your mom you'll be home around 5:00, you mean somewhere near that time, not exactly on the dot.
Around can also suggest being present or nearby in a general way. If your teacher asks whether your friend is around, she's wondering if they're somewhere in the area. When you say you've been around a place or situation before, you mean you have experience with it. A scientist who has been around the laboratory for twenty years knows how everything works.
The word is surprisingly flexible: you might turn around to look behind you, stick around after class to ask a question, or fool around during recess. In each case, the word adds a sense of circular movement, approximate location, or casual presence to whatever action you're describing.