Foreign currency; money used abroad or foreign exchange.
旅行前に少し外貨を両替しておいたほうがいい。
It's better to exchange some foreign currency before traveling.
外貨建ての預金に興味がある。
I'm interested in deposits denominated in foreign currency.
銀行で外貨を引き出した。
I withdrew foreign currency at the bank.
(Somewhat dated) goods from abroad; imported products — a usage found in some contexts.
戦後しばらくは外貨（外国製品）が不足していた。
For a while after the war, foreign goods (imported products) were in short supply.
当時は外貨を使ってしか手に入らない品が多かった。
At that time, many items could only be obtained with foreign currency (i.e., were imported).
この店は外貨（輸入品）を中心に販売している。
This shop mainly sells imported goods.