"extra" as noun
1 - Something additional, such as an item above and beyond the ordinary school curriculum, or added to the usual charge on a bill.
2 - An extra edition of a newspaper, which is printed outside of the normal printing cycle.
3 - A run scored without the ball having hit the striker's bat - a wide, bye, leg bye or no ball.
"extra" as adjective
1 - Beyond what is due, usual, expected, or necessary; extraneous; additional; supernumerary.
2 - Extraordinarily good; superior.
3 - Over the top; going beyond what is normal or appropriate, often in a dramatic manner.
"extra" as adverb
1 - To an extraordinary degree.
