Meaning of ADDITIONAL in English

ADDITIONAL

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 :

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

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.