ad ‧ di ‧ tion ‧ al S3 W2 /əˈdɪʃ ə nəl/ BrE AmE adjective
more than what was agreed or expected SYN extra :
Additional information can be obtained from the centre.
additional costs/expenditure etc
An additional charge is made on baggage exceeding the weight allowance.
REGISTER
In everyday English, people usually say extra rather than additional :
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He gets extra money from his parents.
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THESAURUS
▪ extra in addition to the usual or standard cost, time, amount etc:
They let the kids stay up an extra hour.
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Some stores charge extra for delivery.
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Postage is extra.
▪ additional [only before noun] more than the basic amount or the amount that you expected or agreed. Additional is more formal than extra :
An evening job would provide additional income.
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There may be an additonal charge for paying bills by credit card.
▪ added [only before noun ] extra – used when talking about something that makes something better or more effective:
an added benefit
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an added precaution
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It was a beautiful place, and the good weather was an added bonus.
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Use a sunscreen for added protection.
▪ spare [only before noun] kept in addition to the one you usually use, so that it is available if the one you usually use breaks, gets lost etc:
a spare key
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a spare tyre
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a spare set of clothes