Longman Dictionary of Contemporary English - extra

~1 adj more of something, in addition to the usual or standard amount or number  (Could you get an extra loaf of bread? | Alan had taken extra care with his appearance that evening. | Residents can use the gym at no extra cost. | extra ten minutes/three metres/five kilos etc)  (I asked for an extra day to finish the work.) ~2 adv 1 cost/earn/pay extra to cost, earn, or pay more money than the usual amount  (I earn extra for working on Sunday. | be extra (=cost an additional amount of money))  (Dinner costs $15 but wine is extra. | ten minutes/three metres/five kilos extra)  (I got 2 metres extra to make the curtains.) 2 + adj/adv used to emphasize an adjective or adverb  (You're going to have to work extra hard to pass the exam.) ~3 n 1 something which is added to a basic product or service which improves it and also costs more  (optional extra (=something attractive or comfortable that you can choose to have or not))  (Tinted windows and a sunroof are optional extras.) 2 something attractive or helpful that you do not get more money for  (Lena did a lot of little extras for him that weren't part of her job description.) 3 an actor in a film who does not say anything but is part of a crowd 4 a special edition of a newspaper containing important news  (Extra! Extra! Read all about it!)