An exchange of things of a particular kind happens when two or more people give them to each other at the same time.

An exchange is a brief conversation, usually an angry one.

An exchange of fire, for example, is an incident in which people use guns or missiles against each other.

An exchange is an arrangement in which people from two different countries visit each other's country, to strengthen links between them.

If you do or give something in exchange for something else, you do it or give it in order to get that thing.

If two or more people exchange things of a particular kind, they give them to each other at the same time.

If you exchange something, you replace it with a different thing, especially something that is better or more satisfactory.