Also means
supplementary
Usage Note
Addizionale is a formal, often bureaucratic adjective meaning 'extra' or 'supplementary.' In everyday speech Italians often prefer ulteriore or aggiuntivo, but addizionale is common in legal and tax contexts — for example, imposta addizionale refers to a surcharge tax. It is invariable in gender: un costo addizionale, una spesa addizionale.
Examples
"Ci vuole un documento addizionale."
Natural Translation
An additional document is needed.

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