extra · adjective /ˈek.strə/Full view
A2 more, or more than usual
Dictionary examples:

She babysits to earn a little of extra cash.

He needs extra help with his English.

The price includes travel and hotel, but meals are extra.

Learner example:

You only have to bring an extra t-shirt. (Key English Test; A2; Turkish)

extra · adverb /ˈek.strə/
B1 more
Dictionary example:

They pay her extra to work nights.

Learner example:

Will there be any special events that cost extra? (First Certificate in English; B2; Swedish)

extra · noun C /ˈek.strə/
B1 something that you can get with something else if you pay a little more money
Dictionary example:

A sunroof is an optional extra on this model of the car.

Learner example:

The DVD contains many extras. (Preliminary English Test; B1; Spanish)

extra (ACTOR)
C1 an actor in a who does not have a speaking part and usually plays someone in a crowd
Dictionary example:

A friend of mine is an extra on that movie.

Learner example:

A theat[er] troop at the beginning of a new project is more often than not a flabbergasting rabble of actors, technicians, extras, back-stage workers and so forth. (Certificate in Advanced English; C1; Swedish)

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