: the activity or process of buying, selling, or exchanging goods or services
: the amount of things or services that are bought and sold : the money made by buying and selling things or services
: the act of exchanging one thing for another
: to give something to someone and receive something in return : to give something in exchange for something else
sports : to give (one of your players) to another team in exchange for one of their players
: to stop using (one thing) and start using another
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