ETYM Old Eng. eschange, eschaunge, Old Fren. eschange, from eschangier, French échanger, to exchange; pref. ex- out + French changer. Related to Change, Excamb.
1. The act of exchanging one thing for another.
2. The act of giving something in return for something received.
3. Reciprocal transfer of equivalent sums of money especially the currencies of different countries; SYN. interchange.
4. A mutual expression of views (especially an unpleasant one).
5. A place for buying and selling; open only to members.
6. Chemical process in which one atom or ion or group changes places with another.

1. To give to, and receive from, one another; SYN. change, interchange, trade.
2. To exchange prisoners, employees, etc.