agio
Concise Oxford English Dictionary © 2008 Oxford University Press:
agio /ˈadʒɪəʊ/
▶noun (pl. agios) the percentage charged on the exchange of one currency, or one form of money, into another that is more valuable.
– origin C17: from Ital. agio, aggio, lit. ‘ease, convenience’.
'agio' also found in these Oxford entries:

