Definition of exchange:

part of speech: noun

The act of giving one thing or commodity for another; barter; the act of giving up one condition or state for another; the difference in value of money in different countries; a place where merchants meet- in this sense often written change; a rule in arithmetic.

part of speech: verb

To give one thing for another; to barter; to resign or lay aside one state or condition and take another instead of it; to give and receive the like thing.