sale (Noun) — A particular instance of selling. ex. "he has just made his first sale" ex. "they had to complete the sale before the banks closed"
sale (Noun) — The general activity of selling. ex. "they tried to boost sales" ex. "laws limit the sale of handguns"
sale (Noun) — An occasion (usually brief) for buying at specially reduced prices. ex. "I got some great bargains at their annual sale" ex. "they held a sale to reduce their inventory"
sale (Noun) — The state of being purchasable; offered or exhibited for selling. ex. "you'll find vitamin C for sale at most pharmacies" ex. "the new line of cars will soon be on sale"
sale (Noun) — 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). ex. "the salesman faxed the sales agreement to his home office"