ex·change n
1 a: a giving of something of value (as real property) in return for something of equal value (as money or property of a like kind)
b in the civil law of Louisiana: a giving of something of value in return for something of equal value except money compare sale
2: an organized market or center for trading in securities or commodities
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.