Definition of extra adjective from the Oxford Advanced Learner's Dictionary

  

extra

 adjective
adjective
BrE BrE//ˈekstrə//
 
; NAmE NAmE//ˈekstrə//
 
 
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 more than is usual, expected, or than exists already synonym additional Breakfast is provided at no extra charge. The conference is going to be a lot of extra work. an extra pint of milk The government has promised an extra £1 billion for health care. Take extra care on the roads this evening. The play is to run for an extra week! extra help for single parents see also extra time Word Origin mid 17th cent. (as an adjective): probably a shortening of extraordinary, suggested by similar forms in French and German.
See the Oxford Advanced American Dictionary entry: extra