supplemento
supplement, surcharge
noun soop-pleh-MEN-toh Rare
Origin: From Latin supplementum, from supplere (to fill up).
Also means
supplement (magazine insert)
Usage Note
Supplemento covers both an additional charge (pagare un supplemento = to pay a surcharge, e.g. on a train) and an editorial supplement (il supplemento domenicale = the Sunday supplement). Do not confuse it with integratore (dietary supplement) or allegato (attachment). On Italian trains, a supplemento rapido is the high-speed surcharge.
Examples
"È necessario pagare un supplemento per il rapido."
Natural Translation
You need to pay a surcharge for the fast train.

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