This is the 1059th most frequent Portuguese word.
adicional
Additional; extra.
Here, 'adicional' is used as an adjective describing the noun 'cópia', explaining that the speaker desires one more copy.
Eu quero uma cópia adicional deste documento.
I want an additional copy of this document.
In this context, 'adicional' modifies 'taxa', indicating that there is an extra fee beyond regular charges.
A taxa adicional será aplicada a pedidos urgentes.
An additional fee will be applied to urgent orders.
The word 'adicional' acts as an adjective enhancing 'informações', showing that there is extra or supplementary information provided.