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English definition of “extra”

extra

adjective, adverb [not gradable]  /ˈek·strə/ us  
added, additional, or more than expected: Some students needed extra help. He’s been working an extra two hours a day. I bought some extra batteries.

extra

noun [C]  /ˈek·strə/ us  
something that is added when you pay for goods or a service: We didn’t get any extras on our new car except for the CD player. An extra is also a person in a movie who does not have a speaking part and is usually in the background or in a crowd.
(Definition of extra from the Cambridge Academic Content Dictionary © Cambridge University Press)
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