A star is a large ball of burning gas in space. Stars appear to us as small points of light in the sky on clear nights.

You can refer to a shape or an object as a star when it has four, five, or more points sticking out of it in a regular pattern.

You can say how many stars something such as a hotel or restaurant has as a way of talking about its quality, which is often indicated by a number of star-shaped symbols. The more stars something has, the better it is.

Famous actors, musicians, and sports players are often referred to as stars .

If an actor or actress stars in a play or film, he or she has one of the most important parts in it.

If a play or film stars a famous actor or actress, he or she has one of the most important parts in it.

Predictions about people's lives which are based on astrology and appear regularly in a newspaper or magazine are sometimes referred to as the stars .

If you say that someone should thank their lucky stars that something is the case, you mean that they should be very grateful that it is the case, because otherwise their situation would be a lot worse.