Uncommon means rare or not often seen. When something is uncommon, it doesn't happen or appear very frequently. An uncommon bird might visit your backyard only once or twice a year, while common sparrows show up every day. An uncommon name is one that most people haven't heard before, unlike common names such as Michael or Emma.

The word suggests something special or noteworthy precisely because it's rare. A teacher might praise a student for showing uncommon dedication to a difficult project, meaning that level of commitment is unusual and impressive. When someone displays uncommon courage, they're doing something brave that most people wouldn't do.

Notice the contrast with its opposite: common things are ordinary and everywhere, while uncommon things stand out. An uncommon talent, an uncommon sight, or an uncommon opportunity can feel especially valuable because scarcity can make things seem more interesting or precious. Finding an uncommon seashell on the beach feels more exciting than finding the hundredth common one.