If there is an interchange of ideas or information among a group of people, each person talks about his or her ideas or gives information to the others.

If you interchange one thing with another, or you interchange two things, each thing takes the place of the other or is exchanged for the other. You can also say that two things interchange .

An interchange on a motorway, freeway, or road is a place where it joins a main road or another motorway or freeway.