Definition of extra adverb from the Oxford Advanced American Dictionary

     

    extra

     adverb
    adverb
    NAmE//ˈɛkstrə//
     
     
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  1. 1 in addition; more than is usual or expected, or than exists already to charge/pay/cost extra We don't charge extra for the activities—everything is included in the admission fee. I need to earn a little extra this month. The rate for a room is $75, but breakfast is extra. Now even bigger! Ten percent extra!
  2. 2(with an adjective or adverb) more than usually You need to be extra careful not to make any mistakes. an extra large T-shirt She tried extra hard. Do you have this sweatshirt in an extra large size? He wanted to cook something extra special for dinner that night.
See the Oxford Advanced Learner's Dictionary entry: extra