1an act of giving one thing and receiving another (especially of the same kind) in return:negotiations should lead to an exchange of land for peace [mass noun]:opportunities for the exchange of information
a visit or visits in which two people or groups from different countries stay with each other or do each other’s jobs: [as modifier]:an exchange visit to Germany
2 [mass noun] the changing of money to its equivalent in the currency of another country:they provided me with currency exchange at competitive rates
[count noun] a system or market in which commercial transactions involving currency, shares, etc. can be carried out within or between countries.
[count noun] a building or institution used for the trading of a particular commodity or commodities:the old Corn Exchange
3a short conversation or an argument:there was a heated exchange