The dollar is expected to fall in the foreign exchange markets.
2PEC [uncountable]foreign money, especially money obtained by selling goods to a foreign country:
foreign exchange earned through exports
3alsoexchange [countable]an arrangement through which a student exchanges homes, schools etc with a student from another country for a particular length of time, especially in order to learn a language:
The school organizes a foreign exchange to France.
Definition of foreign exchange from the Longman Dictionary of Contemporary English within the topic CURRENCIES