Basic Guidelines For English Spellings
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Translate extra into Spanish
1Added to an existing or usual amount or number; additional.
2informal predicative Excessive or extravagant.
1as submodifier To a greater extent than usual; especially.
2In addition.
1An item in addition to what is usual or strictly necessary.
Mid 17th century (as an adjective): probably a shortening of extraordinary, suggested by similar forms in French and German.