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English definition of “extra”


more than or added to what is usual or what already exists: Without the extra help, campus leaders may face tough choices, such as whether to cut some programs. extra cash/funding/money extra compensation/income/pay extra charge/expense/fee
go the extra mile to make more effort than is expected of you: Our state government functions as well as it does because our employees routinely go the extra mile.
(Definition of extra adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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