extra

Something additional, such as an item above and beyond the ordinary school curriculum, or added to the usual charge on a bill.

An extra edition of a newspaper, which is printed outside of the normal printing cycle, for example to report an important late-breaking event.

(cricket) A run scored without the ball having hit the striker's bat - a wide, bye, leg bye or no ball.

(acting) A supernumerary or walk-on in a film or play.

(slang) The state or trait of being over the top, of behaving in an overly dramatic manner.

Something of an extra quality or grade.