Extra means more than what's usual, necessary, or expected. When you get extra credit on an assignment, you earn points beyond the normal total. When someone brings extra snacks to share, they brought more than they needed for themselves.

The word suggests a surplus, something beyond the basic amount. A recipe might call for two eggs, but you crack an extra one just in case. Your teacher might assign extra homework if the class needs more practice. A movie's extra features include deleted scenes and interviews that go beyond the main film.

Extra can describe effort too. Going the extra mile means doing more than required, like a student who not only completes the assignment but adds illustrations and a cover page. When someone puts in extra effort, they're working harder than the minimum.

People also use extra to describe someone who's being overly dramatic or doing too much to get attention. If your friend acts shocked and horrified because lunch was served three minutes late, someone might joke that they're being “so extra” about it. In this sense, it's a playful way of saying someone's reaction is bigger than the situation calls for.