sale (n.)

late Old English sala "a sale, act of selling," from a Scandinavian source such as Old Norse sala "sale," from Proto-Germanic *salo (source also of Old High German sala, Swedish salu, Danish salg), from PIE root *sal- (3) "to grasp, take." Sense of "a selling of shop goods at lower prices than usual" first appeared 1866. Sales tax attested by 1886. Sales associate by 1946. Sales representative is from 1910.

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Definitions of sale from WordNet

sale (n.)
a particular instance of selling;
they had to complete the sale before the banks closed
he has just made his first sale
sale (n.)
the general activity of selling;
laws limit the sale of handguns
they tried to boost sales
sale (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
Synonyms: cut-rate sale / sales event
sale (n.)
the state of being purchasable; offered or exhibited for selling;
you'll find vitamin C for sale at most pharmacies
the new line of cars will soon be on sale
sale (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);
Synonyms: sales agreement