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n.
an agreement (or contract) in which property is transferred from the seller (vendor) to the buyer (vendee) for a fixed price in money (paid or agreed to be paid by the buyer); "the salesman faxed the sales agreement to his home office"
n.
an occasion (usually brief) for buying at specially reduced prices; "they held a sale to reduce their inventory"; "I got some great bargains at their annual sale"
n.
the commercial exchange (buying and selling on domestic or international markets) of goods and services; "Venice was an important center of trade with the East"; "they are accused of conspiring to constrain trade"