Longman Dictionary of Contemporary English homepage

extra

4 noun
     
Related topics: Film
extra4 [countable]
1 something which is added to a basic product or service that improves it and often costs more:
Tinted windows and a sunroof are optional extras (=something that you can choose to have or not).
Be careful, there may be hidden extras (=additional charges which you are not told about).
It's got lots of useful little extras.
2AMF an actor in a film who does not say anything but is part of a crowd:
He started his acting career as an extra.

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